Often imitated, never duplicated, this certifiably unique pop musical group has taken the traditional genre of a cappella to a new level. The little miracle that keeps the crowds coming back year after year and constantly draws new fans is Rockapella's astonishing full-band sound. A sound that seems to be impossible coming from just five guys with microphones. No instruments, no tracks, no mirrors – and their hands never leave their wrists. "We're making every bit as much music as the whole Glee chorus – but with only five guys," says Rockapella's human beat-box Jeff Thacher.