Comedian Harmonists

The Comedian Harmonists were an internationally famous, all-male German close harmony ensemble that performed between 1928 and 1934 as one of the most successful musical groups in Europe before World War II. The group consisted of Harry Frommermann (tenor buffo), Asparuh "Ari" Leschnikoff (first tenor), Erich Collin (second tenor), Roman Cycowski (baritone), Robert Biberti (bass), and Erwin Bootz (pianist).

source: Wikipedia