Crossword Genius

Musical effect involving two quickly played repeated notes (5)

Ross

I believe the answer is:

trill

(Other definitions for trill that I've seen before include "Quavering or vibratory sound" , "sing" , "High-pitched warbling sound" , "Warbling sound made by a songbird" , "Rapid alternation of notes" .)

I've seen this clue in the LA Times.
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