Answer:

sang

Answer	Crossword Clue
SANG	Spilled the beans
SANG	Did some karaoke
SANG	Vocalized

SANG	Performed on "American Idol"
SANG	Crooned
SANG	Named names
SANG	Was a stoolie
SANG	Squealed
SANG	Warbled
SANG	Aired out one's pipes
SANG	Told the cops everything

SANG	Caroled
SANG	Did a vocal number
SANG	Did a number
SANG	Finked
SANG	Acted like a rat
SANG	Performed at a cabaret
SANG	Belted out
SANG	Squealed, so to speak

SANG	Succumbed to being grilled
SANG	Did some selling out
SANG	Performed, in a way
SANG	Blew the whistle
SANG	Joined the choir
SANG	Serenaded
SANG	Did the vocals
SANG	Told the cops

SANG	Ratted
SANG	Told all
SANG	Competed in "American Idol"
SANG	Emulated Faith Hill
SANG	Belted out a ballad
SANG	Took charge of the karaoke machine
SANG	Engaged in karaoke
SANG	Acted the ratfink

SANG	Did Donizetti, perhaps
SANG	Confessed, slangily
SANG	Ratted to the fuzz
SANG	Did a ditty
SANG	Sold out or belted out