With three tenors, a baritone, a bass, and pianist Erwin Bootz, the Comedian Harmonists took early 20th century American vocal harmony music and gave it a European, almost Teutonic sensibility. With an eclectic repertoire that took in jazz, pop, film, opera, and cabaret tunes, they were popular in Germany in the early 1930s, as well as other parts of Europe. Leader Harry Frommerman worked out demanding vocal parts for the band that shifted throughout the song, setting them apart from many other popular vocal groups of those and future times. The Comedian Harmonists were torn a...