Bebop differed drastically from the straightforward compositions of the swing era and was instead characterized by fast tempos, asymmetrical phrasing, intricate melodies, and rhythm sections that expanded on their role as tempo-keepers. The music itself seemed jarringly different to the ears of the public, who were used to the bouncy, organized, danceable compositions of Benny Goodman and Glenn Miller during the swing era. Instead, bebop appeared to sound racing, nervous, erratic and often fragmented. But to jazz musicians and jazz music lovers, bebop was an exciting and beautiful revolution in the art of jazz.