(n) :
a method of
sight singing music that uses the syllables
do (originally
ut),
re,
mi,
fa,
sol (or
so),
la, and
si (or
ti) to represent the pitches of the
scale, most commonly the
major scale. The fixed-do system uses do for
C, and the moveable-do system uses do for whatever
key the melody uses (thus B is do if the
piece is in the key of B)