Download "A-Punk" from Rockapella HERE. Rockapella is an American a cappella musical group best known for their series of Folgers Coffee commercials and the Where in the World is Carmen Sandiego? theme song. "Rockapella" is a portmanteau of "rock" and "a cappella". In addition to original vocal music, the group also perform a cappella covers of pop songs. The original group members consisted of Brown University alumni Elliott Kerman, David Stix, Sean Altman, and Steve Keyes, who started performing together sheerly out of their love for music.