Shaky Singer
Puzzle 9 of Endangered Species Pack
Question is: Shaky Singer
and the answer is: TREMOLO
Word Meaning:
TREMOLO — (music) A rapid repetition of the same note, or an alternation between two or more notes. It can also be intended to mean a rapid and repetitive variation in pitch for the duration of a note. It is notated by a strong diagonal bar across the note stem, or a detached bar for a set of notes (or stemless notes).
Definitions from Wiktionary.