HearmonyHow to Transpose Music: Two Methods, a Chord Chart and Worked Examples
To transpose music, you move every note and chord by the same interval, so the piece keeps its shape but sits in a new key. There are two reliable ways to do it: the interval method (move each note up or down by, say, a minor third) and the scale-degree method (turn the notes into numbers in the old key, then rebuild them in the new one).
Both methods give the same result. Below are worked examples from C major to E♭ major, a chart for transposing chords, the capo math for guitar, how transposing instruments like the B♭ clarinet work, and the mistakes that trip most people up.
What is transposition in music?
Transposition is rewriting or playing music at a different pitch level while keeping every interval the same. A singer may need a song lower, a guitarist may want easier chord shapes, or a clarinetist may need a part written for their instrument. The Wikipedia article on transposition covers the formal definitions.
Because the intervals don't change, a transposed tune is recognizably the same tune. The mood, the contour and the rhythm all survive the move; only the pitch level changes.
Method 1: How do you transpose with intervals?
To transpose with intervals, find the interval between the old key and the new key, then move every note by exactly that interval. Do it in three steps:
- Name both keys. From C major to E♭ major.
- Find the interval between the two tonics. C up to E♭ is a minor third: three half steps, and three letter names (C, D, E).
- Move every note up that interval. Count letter names first, then fix the sharp or flat so the distance is three half steps.
Worked example, the opening of "Ode to Joy":
| Key | Opening of "Ode to Joy" |
|---|---|
| C major | E E F G | G F E D | C C D E | E D D |
| E♭ major (up a minor third) | G G A♭ B♭ | B♭ A♭ G F | E♭ E♭ F G | G F F |
Notice the F. Three half steps above F is the key you might call G♯, but the correct name is A♭: a third always spans three letter names (F, G, A), so it must be some kind of A. Counting half steps alone gives you the right key on the piano but the wrong spelling on paper.
Method 2: The scale-degree method
The scale-degree method turns each note into its number in the old key, then reads those numbers in the new key. It is faster for whole melodies and is how many musicians transpose in their heads. If degree numbers are new, the guide to scale degrees and their names explains them.
"Ode to Joy" in degrees is 3 3 4 5 | 5 4 3 2 | 1 1 2 3 | 3 2 2. The E♭ major scale is E♭ F G A♭ B♭ C D, so 1 = E♭, 2 = F, 3 = G, 4 = A♭, 5 = B♭. Read the numbers in that scale and you get the same line as above, with no counting per note.
The new key signature does part of the work for you: E♭ major has three flats (B♭, E♭, A♭), so any B, E or A in the transposed part is already flat. The guide to key signatures lists them for every key.
How do you transpose chords? A chord chart
To transpose chords, swap each chord for the one in the same column of the new key's row. The chord type stays the same: a minor chord stays minor and a seventh chord keeps its 7 (C7 becomes E♭7).
| Key | I | ii | iii | IV | V | vi | vii° |
|---|---|---|---|---|---|---|---|
| C | C | Dm | Em | F | G | Am | B° |
| G | G | Am | Bm | C | D | Em | F♯° |
| D | D | Em | F♯m | G | A | Bm | C♯° |
| A | A | Bm | C♯m | D | E | F♯m | G♯° |
| E | E | F♯m | G♯m | A | B | C♯m | D♯° |
| F | F | Gm | Am | B♭ | C | Dm | E° |
| B♭ | B♭ | Cm | Dm | E♭ | F | Gm | A° |
| E♭ | E♭ | Fm | Gm | A♭ | B♭ | Cm | D° |
Example: C–Am–F–G in C is I–vi–IV–V. In E♭ that is E♭–Cm–A♭–B♭; in G it is G–Em–C–D. Writing progressions as numbers in the first place makes this automatic, which is the whole idea of the Nashville number system.
A chord that isn't in the key, such as a B♭ in a C major song, moves by the same interval as everything else. Up a minor third, B♭ becomes D♭.
Transposing with a capo
A capo raises every string by one half step per fret, so the chord shapes you play stay the same while the sound moves up. The rule: shape + capo fret (in half steps) = the key you hear.
| Shapes you play | Capo | Sounding key |
|---|---|---|
| G shapes (G, C, D, Em) | 2nd fret | A |
| G shapes | 3rd fret | B♭ |
| C shapes (C, F, G, Am) | 3rd fret | E♭ |
| D shapes (D, G, A, Bm) | 2nd fret | E |
Working backward: a song in E♭ with awkward barre chords becomes easy if you play C shapes with a capo on the 3rd fret.
Transposing instruments: why a B♭ clarinet reads a different note
A transposing instrument sounds a different pitch from the one written. When a B♭ clarinet, B♭ trumpet or tenor saxophone plays a written C, you hear a B♭ (a major second lower on clarinet and trumpet, a major ninth lower on tenor sax). Their parts are therefore written higher than concert pitch.
| Instrument | Written C sounds | To write their part | Concert C major becomes |
|---|---|---|---|
| B♭ clarinet, B♭ trumpet | B♭, a major 2nd lower | Up a major 2nd | D major |
| E♭ alto saxophone | E♭, a major 6th lower | Up a major 6th | A major |
| F horn | F, a perfect 5th lower | Up a perfect 5th | G major |
The list of transposing instruments on Wikipedia covers the less common ones, such as the A clarinet and the E♭ baritone sax.
How to hear that a melody is the same in another key
You recognize a transposed melody because your ear tracks the intervals and the scale degrees, not the exact pitches. That is relative pitch at work, and you can test it on any keyboard. Play "Twinkle, Twinkle" from C (C C G G A A G), then from D (D D A A B B A): same song. Now play it from D but with B♭ instead of B. One wrong note, and the tune is no longer the same; that is the sound of a forgotten key signature.
Training this makes transposing by ear possible: if you hear a song as "3 3 4 5", you can start it on any note.
Common mistakes and how to fix them
- Counting only half steps. You get F up a minor third = G♯ instead of A♭. Fix: count letter names first, then adjust the accidental.
- Forgetting the new key signature. Fix: write it in before the first note.
- Changing chord quality. Am must stay minor. Fix: transpose the root only and copy the suffix (m, 7, maj7, sus4).
- Moving the wrong direction. C to A can mean up a major sixth or down a minor third. Fix: choose the direction that keeps the melody in a comfortable range.
Self-test: (1) Transpose C–E–G up a major second. (2) Move G–Em–C–D from G to D. (3) Move F–B♭–C down a whole step. (4) A concert F for a B♭ trumpet is written as? Answers: D–F♯–A; D–Bm–G–A; E♭–A♭–B♭; G.
Practice hearing in any key with Hearmony
Hearmony doesn't transpose sheet music for you; it trains the ear that makes transposing feel natural. In Home Key Harbor, a short I–IV–V–I cadence sets the key (C, D, E or F, chosen at random), then one note plays and you name its scale degree in solfège. Because the key keeps changing, you learn to hear "this is mi" rather than "this is E". Progression Highway does the same for chords: progressions play in C, D, F or G and you name them in numerals.
Home Key Harbor and Progression Highway are part of Hearmony Pro; the free Chord Numbers side quest is the place to start if numerals are new. For a full routine around these skills, see the ear training exercises for beginners. Hearmony is available on the App Store for iPhone.