The Bobs have broken with a cappella tradition several times by including instruments. The majority of the 1995 album "Plugged" is backed by toy drums. "Plugged" also made heavy use of studio equipment to make the voices sound more like guitars and bass guitars. "Coaster" includes a rock rhythm section on one song. "Rhapsody in Bob" features their arrangement of Gershwin's "Rhapsody in Blue" with pianist Bob Malone playing most of the original piano concerto as The Bobs become a vocal orchestra. But this original "band without instruments" usually uses just their mouths, hands, feet and "other body parts".