Answer:

fas

Answer	Crossword Clue
FAS	Musical syllables
FAS	Fourth notes
FAS	Mi's scale followers

FAS	Scale notes
FAS	Mi followers
FAS	Notes in a scale
FAS	Mis' neighbors
FAS	Monogram of "Ol' Blue Eyes"
FAS	Mi-sol go-betweens
FAS	Notes of scales
FAS	Followers of mis

FAS	Musical fourths
FAS	Notes after mis
FAS	Solfeggio tones
FAS	Mis' followers
FAS	Notes before sols
FAS	Scale fourths
FAS	Solfeggio syllables
FAS	Solmization syllables

FAS	Singer's warmup syllables
FAS	They're fourth on a musical scale
FAS	Musical notes
FAS	Sols' neighbors
FAS	Notes between mis and sols
FAS	Fourth notes in a scale
FAS	Notes above mis
FAS	Sol-... (does some practice singing)

FAS	Roman divine law, distinguished from jus.
FAS	Fez: Arabic.
FAS	Roman divine law.
FAS	Divine law: Lat.
FAS	Musical syllables.
FAS	Musical notes.
FAS	Relative of f. o. b.
FAS	Divine law of the Romans.

FAS	Justice: Lat.
FAS	Religious law: Lat.
FAS	Scale notes.
FAS	Notes
FAS	Notes of the scale.