Here's a couple of the more popular ones.
HARD ROCK HOTEL Pink Taco: Yo Quiero Karaoke at 10 p.m. Wednesdays at 4455 Paradise Road (693-5066).
TROPICANA Hotel Karaoke from 8:30 p.m.-12:30 a.m. Wednesdays and Thursdays, and from 9 p.m.-1 a.m. Fridays and Saturdays in the Tropics Lounge at the Tropicana, 3801 Las Vegas Blvd. South (739-2222).
I just returned from a week trip and I'm wiped out. This town doesn't stop! Swrdy when you go I'm expecting a full report back! in Trip Reports :)
Enjoy...