This self-styled “crack squad of supercrooners,” an a cappella octet drawn from the U-M Men’s Glee Club, performs pop songs, oldies, and more. Tonight they are joined by the Chinese yo-yo troupe Revolution! 8 p.m., Rackham Auditorium. Tickets $15 (students, $10) in advance at the-friars.com & at the door. [email protected].