A cappella music preceded rock as the soundtrack of rebellion, often spurring parents to reprimand harmonizing teens who wouldn't turn down their booming voice boxes. Strike a resounding chord sans punishment with today's Groupon: for $45, you get one ticket for orchestra seating to see Voca People at Westside Theatre (a $79.50 value). Groupon tickets are valid for any show dates through July 31. Parking is available at 500 West 43rd Street for $12 with a validated ticket stub (parking fee not included in this Groupon). Regular phone and Internet order service charges ($7.50+) are not included in this Groupon.

The creative brainchild of composer Shai Fishman and performance artist Lior Kalfo, the space-alien ensemble Voca People has awed worldwide audiences with dynamic a cappella performances of popular tunes. Clad in white suits and with stark ivory face paint, this skilled intergalactic octet breaks into dynamic beatbox rhythms and harmonious, nonconfrontational intonations as colorful lights underscore the energetic vocal riffs and hands-free drum solos. The vocal virtuosos harmonize and percussively bop to popular tunes from performers such as Michael Jackson, Scott Joplin, and the Spice Girls, plucking spectators from the audience to serenade. The often-comical showcase builds in intensity throughout the performance to refuel the troupe's traveling spaceship with upbeat musical fuel, which is less pricey than ethanol wrung from frowns.