kids is a form of:

Sol-fa



ENGLISH MEANING
noun
1.
The gamut, or musical scale.
verb
1.
(INTRANSITIVE) To sing the notes of the gamut, ascending or descending; as, do or ut, re, mi, fa, sol, la, si, do, or the same in reverse order.
2.
(TRANSITIVE) To sing to solmization syllables.