The twelve-tone technique—also known as dodecaphony, twelve-tone serialism, and (in British usage) twelve-note composition—is a method of musical composition first devised by Austrian composer Josef Matthias Hauer, who published his "law of the twelve tones" in 1919.
this is because the rhythm section is meant to support the ensemble. Yes the rhythm section does have solos however without the rhythm section the ensemble would sound dull and boring.
