It’s humiliating. It’s earsplitting. It’s downright tacky. It’s you up there crooning into a microphone. It’s karaoke, the hottest campus bar activity since animal thumper. No voice? No problem. Just stick to these guidelines:1. Never, never try to do Mariah Carey (or, for that matter, anything that requires vocal talent).2. Stay away from high notes, low notes, slow songs, and drawn-out solos.3. Remember, misery loves company: If you’re going to be mortified on stage, might as well bring along a friend.