In 1926, Crosby and Rinker moved to Los Angeles, and with the help of Rinker's sister, jazz singer Mildred Bailey , came to the attention of famous orchestra leader Paul Whiteman . Soon after joining Whiteman's band, the two teamed with singer-songwriter Harry Barris to form a group called the Rhythm Boys, whose snappy harmonies and lively scat singing made them the leading vocal group of 1920s jazz. By the late 1920s, studios and auditoriums were using more sophisticated...