File:Ch1930.jpg

The Comedian Harmonists in 1930 (from left: Robert Biberti, Erich Collin, Erwin Bootz, Roman Cycowski, Harry Frommermann, Ari Leschnikoff)

Fair use rationale for Comedian Harmonists
This is a ubiquitous photograph found on everything from Harmonist advertisements to vinyl record covers and CD cases. Admittedly, all such instances obviously did not have merely the photograph but also had text surrounding it. Therefore, this is either derived from one of the aforementioned sources or is the base image that was used in them. Pure, free-license photographs of the group seem impossible to find.