A cappella music is specifically group or solo singing without instrumental accompaniment, or a piece intended to be performed in this way. It contrasts with cantata, which is usually accompanied singing.

Crazy by Gnarls Barkley
University of South Carolina Cocktails A Cappella

Film
Director/Cinematographer – Ricky Hartzog
Editor – Jaynie Buford

Audio
The Vocal Company
Recording/Mixer – Jill Clark

Vocal Mastering
Mastering – Dave Sperandio
Soloist: Lily Kleinbub
Vocal Perc: Jaynie Buford
Arr: Natalie Gilbert