Answer:

OTTAVA

Answer	Crossword Clue
OTTAVA	At an adjacent interval, in music
OTTAVA	.. rima (eight-line stanza)
OTTAVA	Eighth: It.

OTTAVA	Musical direction
OTTAVA	In music, a full interval higher or lower than written
OTTAVA	Interval for Rossini
OTTAVA	Score marking to play higher or lower than written