What's the difference between movable do and fixed do?

Movable do: 'do' is always the tonic of the current key. In C major, do=C; in G major, do=G. The same syllables describe the same scale degree across every key. Fixed do: 'do' is always C, regardless of the key. In G major, the tonic is still called 'sol'. Movable do is the system used in tonic solfa, jianpu, and Kodály pedagogy; fixed do is the standard in French and Italian conservatories.

Which is better for learning to sight-sing?

Movable do, by a wide margin for most learners. Because the syllables describe relative intervals, you can transpose any melody to any key and sing it the same way. Fixed do trains absolute pitch recognition but makes transposition cognitively harder.

Almost universally movable do, British, African, American, Filipino, and most Asian choir traditions use movable do. The exception is conservatory choirs in France, Italy, and parts of Latin America, where fixed do is the local convention.

Does DomiSol support both?

DomiSol is built around movable do, tonic solfa (d r m f s l t) and jianpu (1 2 3 4 5 6 7) are both movable-do systems. Fixed-do labelling isn't built in; that's an explicit design choice because movable do is the system 99% of the target audience reads.

6 min read · Updated 2026-05-26

Foundational concept

Movable do vs fixed do, which solfege to learn.

Two solfege systems share the same syllables but use them in opposite ways. The choice shapes how you'll sight-sing, transpose, and teach for the rest of your career.

The two systems, in one sentence each

Movable do: 'do' is always the tonic of the current key. In C major, do=C. In G major, do=G. In F major, do=F. The syllables track scale function, not absolute pitch.

Fixed do: 'do' is always C, regardless of key. In G major, the tonic is still called 'sol' (because G is the fifth of C). The syllables track absolute pitch, not scale function.

Side by side

	Movable do	Fixed do
'do' in C major	C	C
'do' in G major	G	C (the tonic is 'sol')
Transposition	Free, the syllables never change	Every syllable changes
Sight-singing by	Interval and scale function	Absolute pitch
Dominant in	UK, Africa, US (Kodály), much of Asia	France, Italy, Spain, Latin America
Best for	Choral singing, ear training, transposing instruments	Pitch identification, atonal repertoire
Weakest at	Music with no clear tonic	Singing the same tune in a new key

Why movable do dominates

Three reasons, and they compound. Transposition is free: the syllables describe scale degrees, so a hymn moved from F to D reads identically, only the sounding pitch changes. Sight-singing is interval-based: d–m is a major third in every key, so a singer learns seven relationships once instead of relearning them per key. It needs no absolute pitch: the system works entirely on relationships between notes, which is why it scales to a whole choir rather than the handful of people who can name a pitch cold.

That combination is why movable do carries British school music, the Kodály method in the US, and the choral traditions of Nigeria, Ghana, Kenya and South Africa, where tonic solfa is the first notation most singers learn.

Where fixed do still wins

Fixed do is the conservatory standard across France, Italy, Spain and much of Latin America, and it earns that position in two situations. It pairs naturally with absolute-pitch training, because the syllable and the pitch are the same fact. And it handles atonal and heavily chromatic music, where movable do has a genuine problem: if there is no tonic, there is nothing for 'do' to anchor to.

Which should you learn?

Choir singer or director — movable do. It is what your repertoire is written in and what transposition demands.
Conservatory student — whichever your institution teaches. Fighting the local tradition costs you more than either system's advantages are worth.
Songwriter or self-taught composer — movable do. Thinking in scale degrees is thinking in harmony.
Sight-singing teacher — movable do, unless your syllabus mandates otherwise. It gets beginners reading faster.

The two are not mutually exclusive, and plenty of professional musicians read both. But learn one properly first, mixing them early is the reliable way to end up fluent in neither.

Practice movable do in DomiSol

DomiSol is movable-do all the way down. Write a melody in any key, the syllables stay the same; only the playback pitches change.

Open the free tonic solfa editor →