Tonic solfa

Tonic solfa is a notation system where pitch is named by its function inside the key rather than by an absolute frequency. The first scale degree is always 'do' (d), regardless of whether the piece is in C, G, or D, so a melody that runs d m s reads identically across keys. Developed in 19th-century England by John Curwen from Sarah Ann Glover's earlier work, tonic solfa is the dominant choral notation in British, African (Nigerian, Ghanaian, South African, Kenyan), and Filipino traditions, especially for hymnody.

Etymology & origin

From Italian solfeggio ('to sing by sol-fa'), itself rooted in the medieval Guidonian syllables ut-re-mi-fa-sol-la coined by Guido of Arezzo in the 11th century. 'Tonic' was added by 19th-century English pedagogues to mark this as the movable-do variant where the syllables track the tonic, not fixed pitches.

In context

Example	What it means
d r m f s l t d'	Ascending major scale, d (do) through d' (octave above)
Key: G | d :m :s | m :- |	Bar of music in G major: the chord G–B–D held over a half note
s, l, t, d	Lower-octave run (sub-comma marks octave down) leading into the tonic

Sources

Reference: en.wikipedia.org , consulted for the definition above; DomiSol's wording is original.