Accordion sheet music looks like piano music and only half of it behaves that way. The upper staff is ordinary treble clef for your right hand. The lower staff looks like bass clef and is doing something quite different: it tells you which buttons to press, not which pitches to play.
That one distinction is what stalls most people, particularly pianists, who read the bass staff correctly and still press the wrong thing. This guide covers both staves, the chord letters, the counterbass marking, and how to read the two hands together.
The Short Version
- Treble staff, upper: right hand. Read it exactly as you would piano music.
- Bass staff, lower: left hand. Each note names a button on the Stradella bass board.
- Letters beside the bass notes tell you whether a button is a single bass note or a chord, and which kind.
- A short line above a bass note means the counterbass row rather than the fundamental row.
The Treble Staff: Your Right Hand
Nothing unusual here. On a piano accordion the right hand keyboard is a piano keyboard, and the notation is standard treble clef. If you read piano music, you can read this line today.
On a chromatic button accordion the notation is identical. The notes mean the same pitches; only the physical layout under your fingers differs, which is a fingering problem rather than a reading one.
Two things appear on this staff that a pianist will not recognise, and both sit above the notes rather than in them: register switch markings and, on some editions, bellows marks. Both are covered below.
The Bass Staff: Not What It Looks Like
This is where accordion notation stops being piano notation.
On a piano, a note on the bass staff tells you a pitch and you choose the key that produces it. On a Stradella bass accordion, a note on the bass staff tells you which button to press. The button then produces a fixed note, or a fixed three note chord, decided by the instrument rather than by you.
So the bass staff is closer to tablature than to pitch notation. It is written on a bass clef because that is the convention, and reading it as pitch will mislead you in two specific ways:
- You do not control the octave. The button sounds where the instrument puts it. A bass note written low and one written higher may sound closer together than they look.
- You do not control the chord voicing. A chord button plays its three notes in a fixed arrangement. There is no inversion to choose.
Pianists find this liberating or frustrating depending on the day. Either way, the left hand is making far fewer decisions than it would at a keyboard.
The Stradella Bass Board, Briefly
You cannot read the bass staff without a rough picture of the button board it describes. On a standard Stradella instrument the buttons run in diagonal rows, and each row does one job:
- Counterbass row: single notes, a major third above the fundamental.
- Fundamental bass row: single notes. This is the main one and the row most bass notes refer to.
- Major chord row.
- Minor chord row.
- Seventh chord row.
- Diminished chord row.
Along the rows the roots follow the circle of fifths, so moving one button one way takes you up a fifth and the other way down a fifth. That is why accordionists find key changes physically easy and why the bass board feels illogical for about a week and obvious afterwards.
How Single Bass Notes Are Written
A plain note on the bass staff, with no letter beside it, means press the fundamental bass button with that name. A written C means the C fundamental bass button.
The written pitch is a label, not an instruction about octave. What you are reading is the name of the button.
How Chords Are Written
A chord is written as a note on the bass staff with a letter beside or below it, naming the row:
- M for major. Some editions write nothing at all for major, which is a common source of confusion.
- m for minor.
- 7 for the seventh row.
- d or dim for diminished.
So a written C with an m beside it means the C minor chord button, not a C note. The note head names the root and the letter names the row, which together name exactly one button.
Editions vary in where they put the letter and in whether they use capital or lower case, so the first thing worth doing with any new book is checking its key or preface for the conventions it uses. There is no single universal standard here, which is worth knowing before you decide you have misread something.
Counterbass Notation
A short horizontal line or dash above a bass note head means use the counterbass row rather than the fundamental row.
This matters more than it sounds. The counterbass sits a major third above the fundamental, and writers use it to make bass lines move smoothly rather than leaping around the circle of fifths. Ignore the marking and the notes will still be broadly correct and the line will lose its shape.
Reading Both Hands Together
Take the most common accordion pattern there is, the oom pah of a polka or a waltz. In the bass staff you will see a single bass note on the strong beat and a chord on the weaker beats, alternating.
In 3/4 that reads as: bass note, chord, chord. In 2/4: bass note, chord, bass note, chord. The right hand carries the melody over the top in ordinary treble clef, and the two are read simultaneously exactly as piano music is.
Once you see that pattern you will see it everywhere, because it underpins most of the repertoire in polka, zydeco and the other accordion driven genres.
Bellows Markings
On piano and chromatic accordions the bellows do not change the pitch, so bellows direction is a musical choice rather than a requirement. Where editions mark it, you will see an open or closed symbol, or simply the words push and pull, indicating where to change direction so you do not run out of air mid phrase.
On a diatonic accordion this is a different matter entirely. Those instruments are bisonoric, meaning a button sounds one note on the push and a different one on the pull, so bellows direction is part of the notation rather than an annotation on it. Diatonic music is also frequently written as tablature with button numbers rather than as standard notation, which is a separate system from everything above.
Register Switch Markings
The switches above the right hand keyboard combine different reed sets, and that is what produces the instrument’s range of voices. Editions indicate them with small circular symbols containing dots, where the dots show which reed banks are engaged, or simply with names such as bassoon, clarinet or master.
These are suggestions rather than instructions in most cases, and they assume an instrument with that particular set of switches. Ignoring them will not make you wrong, only less interesting.
If You Already Read Piano Music
Most of your reading transfers, and the parts that do not are specific.
- Transfers: the treble staff entirely, rhythm, key signatures, dynamics, phrasing.
- Does not transfer: the bass staff as pitch. Retrain yourself to read it as button names.
- New to learn: the chord letters, the counterbass line, register marks, and bellows management, which has no piano equivalent at all.
The honest summary for a pianist is that half the instrument costs you nothing and the other half is genuinely new.
The Mistakes That Slow People Down
- Reading the bass staff as pitch. The single biggest one, and it mostly affects people who read music well already.
- Missing the chord letter and playing a bass note where a chord was written, or the reverse.
- Assuming no letter means no chord. In some editions a bare note head with a chord rhythm means major.
- Ignoring the counterbass line, which flattens the bass line.
- Treating bellows direction as decoration on a diatonic instrument, where it changes the notes.
- Not checking the edition’s key. Conventions differ between publishers and countries.
How to Practise This
- Read the hands separately first. The right hand is already familiar, so give the time to the left.
- Say the bass line out loud as button names rather than as notes. “C, C major, G, G seventh.” This builds the right mental habit from the start.
- Start with music in C, G and F, where the buttons sit close together on the board.
- Work from simple polkas and waltzes, because the oom pah pattern is predictable enough that you can watch the notation rather than fight the music.
- Keep a bass board diagram beside the stand for the first few weeks.
Public domain editions are a cheap way to get volume of reading practice, and IMSLP holds a great deal of older accordion and arrangement material. Pair that with the beginner guide to the instrument if you are still deciding which type to learn on.
A Worked Bar
Notation makes more sense against something concrete. Take one bar of a simple waltz in C, in 3/4.
What Is on the Page
- Treble staff: three quarter notes, E then G then E.
- Bass staff: a quarter note C on beat one, then a note head G with the letter M beside it on beats two and three.
What You Play
- Beat one: right hand E. Left hand presses the C fundamental bass button.
- Beat two: right hand G. Left hand presses the G major chord button.
- Beat three: right hand E. Left hand presses the G major chord button again.
Notice what the bass staff did not tell you. It did not say which three notes are in that G major chord, or in which octave any of it sounds. The button decides both. Your only decision was which button.
Now change one thing. Put a small line above that C on beat one, and you are no longer pressing the C fundamental. You are pressing the counterbass button a major third above it, and the bass line now steps rather than jumps into whatever follows.
Free Bass and Other Systems
Everything above describes the Stradella system, which covers the large majority of accordions and of printed accordion music. Two other systems exist and are worth recognising so you do not try to read them the same way.
Free bass gives the left hand single notes across a full chromatic range instead of preset chords. Music for it is written as real pitch notation on the bass staff, which means it reads much more like piano music and much less like the system described here. Some instruments are convertors and switch between the two, and the score will mark where that happens.
Diatonic tablature replaces the staff altogether with button numbers and push or pull marks. It is specific to the instrument it was written for, so tablature for a two row box in G and C will not transfer to one in D and G.
If a piece of accordion music looks wrong when you read it by the rules above, check which of the three systems it is written in before assuming you have misunderstood.
Frequently Asked Questions
How do you read accordion sheet music?
Read the upper treble staff as ordinary piano music for your right hand. Read the lower bass staff as button names for your left hand, where the note head gives the root and any letter beside it gives the row, such as m for minor or 7 for seventh.
Is accordion sheet music the same as piano sheet music?
The right hand is identical. The left hand is not: on a piano the bass staff tells you pitches, and on a Stradella accordion it tells you which button to press, with the instrument deciding the octave and the chord voicing.
What do the letters under accordion bass notes mean?
They name the row of buttons. M is major, m is minor, 7 is the seventh row and d or dim is diminished. A note with no letter is usually a single fundamental bass note.
What does a line above an accordion bass note mean?
Use the counterbass row instead of the fundamental row. The counterbass sits a major third above the fundamental and is used to keep bass lines moving smoothly.
Can you read accordion music if you play piano?
The treble staff yes, immediately. The bass staff needs retraining, because you have to stop reading it as pitch and start reading it as button names.
What clef is accordion music written in?
Two staves, treble clef on top for the right hand and bass clef below for the left. The bass clef is a convention here rather than a straightforward pitch instruction.
Do you need to read music to play the accordion?
No. A great deal of accordion music in folk traditions is learned by ear, and many strong players read little or nothing. Reading opens up written repertoire and makes learning new pieces faster.
What are the circles with dots on accordion sheet music?
Register switch markings. The dots show which reed banks to engage, which changes the voice of the right hand. They assume an instrument with that set of switches and are usually suggestions.
How is diatonic accordion music written?
Often as tablature with button numbers and bellows direction rather than as standard notation, because those instruments sound different notes on the push and the pull.
Why does my bass note sound in a different octave than written?
Because you do not choose the octave. The button sounds at a fixed pitch set by the instrument, and the written note is naming the button rather than specifying where it sounds.
The short way to hold all of this: the top staff is music and the bottom staff is a map. Read one as notes and the other as buttons, and accordion notation stops being strange. More on the instrument and its traditions in the music writing here.
