By 1954 vocal ensembles were grabbing an ever-larger share of the African-American record-buying dollars. United Records had wisely entered the doowop market in 1953, and by 1955 could be considered competitive in the flourishing vocal group market. Chop Chop Boom (Delmark 703) was devoted to groups issued on the subsidiary States label while Bang Goes My Heart features groups issued on the United imprint; The Moroccos, The Answers, The Sheppards and The Pastels. Contains twelve previously unissued tracks. Descriptive notes by Bob Pruter, author of Doowop:The Chicago Scene.