How to transpose music to another key, step by step

To transpose music, pick the interval you're moving by (C to D is up a whole step), write the new key's signature, then move every note by that same interval: the same number of letter names each time, and the same number of half steps. A note that carried a sharp, flat or natural in the old key gets one in the new key, respelled to fit. Then play it through and check it against the original.

Transposing changes the pitch of every note and nothing else. The rhythm, the phrasing and the distance between any two notes stay as they were. The steps:

1. Count the interval in letter names and in half steps. C to D is one letter name and two half steps; C to G is four letter names and seven half steps.
2. Change the key signature. Moving up a fifth adds a sharp or takes away a flat, and moving up a fourth adds a flat or takes away a sharp.
3. Choose a direction. Up a fifth and down a fourth land in the same key, an octave apart, so on the piano pick whichever keeps the right hand readable and the left hand out of the mud.
4. Respell the accidentals. Each one moves by the same interval, but its sign can change: an F♯ in C becomes a G♯ in D, and a B♭ in C becomes a C natural in D.

Pick the new key and count the interval

Transpose when the melody sits too high or low for a singer, when the key has more sharps or flats than your student reads yet, or when the part has to match another instrument.

Once you know the new key, count the interval from the old keynote to the new one. The common moves, counted up from C:

To count half steps, count piano keys, black and white. Each key is one half step from the next. On the piano notes chart, click any key to see and hear its name.

Then look up the new key's signature. A minor key takes the signature of the major key three half steps above it, so A minor has none, like C major, and E minor has one sharp, like G major.

When a key has two names, pick the one with fewer sharps or flats. Up a half step from C is D♭ major, with five flats. C♯ major sounds the same but needs seven sharps, which are harder to read.

Move every note by the same interval

Here's the opening of Ode to Joy in C, then moved up a fifth to G and up a whole step to D. Each row is the first four bars; the rhythm is the same in every key, with the dotted quarter, eighth and half note in bar 4.

For G, every note moves up four letter names and seven half steps: E to B, F to C, G to D. G major has one sharp, F♯, and it goes in the key signature even though this phrase never uses an F.

The PlayableNotes library has Ode to Joy in C, G and D, and the G version's first four bars match the G major row. For a whole page to try this on, there's a free easy piano Ode to Joy.

The move to D is smaller: one letter name and two half steps for every note. E to F is only one half step, so E becomes F♯, and D major's key signature (F♯ and C♯) already carries the sharp.

Count letter names first and half steps second. If you count only half steps, you can end up writing a G♭ where the key wants an F♯. They're the same key on the piano, but the wrong spelling makes the page harder to read.

The scale-degree row is a quicker method for a melody that stays in its key. Number each note by its place in the old key's scale (in C, C is 1, D is 2, E is 3), then write the same numbers in the new key's scale: in G, 3 is B and 5 is D. A note outside the scale keeps its sign beside the number, so an F♯ in C is a raised 4, which becomes a G♯ in D.

Direction matters on the piano. Up a fifth puts this melody in the middle of the treble staff, and down a fourth puts the same notes around middle C.

Respell the accidentals for the new key

The key signature takes care of most notes. Watch the ones with a sharp, flat or natural written in front of them: move each by the same number of letter names, then add whatever sign gets the half steps right.

• C to D (up a whole step): an F♯ becomes a G♯, written with a sharp because D major has no G♯ in its signature. A B♭ becomes a C natural, and since D major's signature makes every C a C♯, it gets a natural sign.
• C to E♭ (up a minor third): an F♯ moves up two letter names and three half steps, so it becomes an A natural, again written with a natural sign.
• G to F (down a whole step): a C♯ becomes a B natural. F major's signature flattens every B, so this one needs a natural sign too.
• C to E (up a major third): a D♯ becomes an F double sharp (𝄪). E major's signature already makes every F an F♯, and the note has to go one half step higher still.

A key change partway through the piece moves by the same interval, so in a move from C to D, a middle section in G goes to A.

In minor keys, watch the raised seventh note. Moving from G minor to A minor takes away the two flats in the key signature, but the F♯ that leads back to G becomes a G♯, and it still has to be written in every time.

When the page is done, count the bars against the original, check that the last bass note is the new keynote (it usually is), then play it slowly, hands separately. A missed accidental is easier to hear than to see.

Transposing instruments work the same way

Some instruments read music written at a different pitch from the one they sound. A B♭ clarinet sounds a whole step lower than written, so its part goes a whole step higher than the piano score, with two more sharps or two fewer flats. A piano melody in B♭ becomes a clarinet part in C. For each instrument, write the part higher by the distance it sounds below the piano:

Transposing a piano piece in PlayableNotes

For piano music, PlayableNotes does the copying out for you. Open one of the free public-domain pieces in the library, import a MusicXML file (also free), or upload a photo, screenshot or PDF of your page. Reading a page costs 1 credit per line of music, where a line is the treble and bass staff together, so a page of piano music is usually 5 to 7 credits.

Then ask the AI chat for the key in words: "put it in G", "a whole step lower" or "a key with no sharps or flats" (the transpose piano music page shows an example). Both hands, the key signature and the accidentals move together, and the result is saved as a new version, so the original key is still there.

Play it back at any tempo, then print it, download PDF, MusicXML or MIDI, or send your student a practice link. Changing the key is free, like every other edit, within a fair-use cap of 100 AI edits a day.

Check the reading before you change the key, because a wrong note moves along with everything else. In the Amazing Grace key change from G to F, two bass notes in the reading needed correcting first; after the change, every note sat exactly two half steps lower.

There are limits. PlayableNotes reads two-staff piano music only: it can't read a vocal line, a guitar part, a band score or a lead sheet, and handwritten music isn't a supported input. For a clarinet or horn part, or for chord symbols, you're back to the pencil method above.

Try it with a piece your student needs in another key on your projects page; new accounts start with 50 free credits.