Answer
Tommy Dorsey's band became extremely successful in the late 1930s. This was a time when big bands were very popular, and Dorsey's band was one of the best. The band featured some of the best musicians of the time, including Dorsey on trombone, Jimmy Dorsey on clarinet, and Frank Sinatra on vocals. The band's music was upbeat and danceable, and it quickly became a favorite of audiences everywhere.