 Whereas the key ensemble of the swing era was the big band of up to fourteen pieces playing in an ensemble-based style, the classic bebop group was a small combo that consisted of saxophone (alto or tenor), trumpet, piano, guitar, double bass, and drums playing music in which the ensemble played a supportive role for soloists.Rather than play heavily arranged music, bebop musicians typically played the melody of a song (called the "head") with the accompaniment of the rhythm section, followed by a section in which each of the performers improvised a solo, then returned to the melody at the end of the song.Some of the most influential bebop artists, who were typically composer-performers, are