Tuesday karaoke nights at the Triple Door’s swanky Musiquarium Lounge are daunting. The candlelit bar is full of businesspeople unwinding after work and couples on intimate dates. Happy hour specials (10 p.m.-12 a.m.) are a notch above well drinks and pub fare, and include $4 house-made lychee vodka and stuffed calamari. You do not want to fuck up the ambiance here with an insufferable performance of Baha Men’s “Who Let the Dogs Out?” The Musiquarium—named after the room’s huge, dazzling aquarium—is more appropriate for crooning mellow numbers like, say, the Beatles’ “Yesterday”—as a group of visiting Japanese businessmen proved with gusto during a recent visit. The patrons here are too polite to make their displeasure evident, even if you ruin the good vibe. But you can be certain that they will quietly resent you the rest of the evening. Select your song wisely. A little practice in the shower beforehand wouldn’t hurt. ERIKA HOBART

Tuesdays, 10 p.m.-1 a.m., 2009