Which of the following is not true of Duke Ellington's career after leaving the Cotton Club?

a. his band crisscrossed the globe under a hectic touring schedule
b. he became known for his prodigious output as a composer and an arranger
c. he broke up the band and experimented with a small jazz combo during the bebop era
d. he composed numerous popular songs such as "Sophisticated Lady" and "Prelude to a Kiss"

c