Black Angus steakhouse, a block up from 535 off Palm Parkway (in with Kobe, Hooters, et al).
IIRC, a sushi place in either the Dolphin or Swan also has karaoke.
Fridays Front Row (on I-Drive) used to have it Tuesdays/Thursdays, not sure if this is still the case. Also on I-Drive, LuLus in Pointe Orlando had it on Mondays, if it is still open.