According to the notes, Big-band writing consisted of four sections. These sections were trumpets, bones, saxes, and rhythm. The role of the rhythm section changed during the big-band/swing era. For example, the bass walks all four beats, there was the introduction of the electric guitar in 1936, the piano was played with a less stride style and more of a comping style, and the drummers of this era used new advances on their instruments such as the hi-hat cymbals or that they drove with the bass drum on all four beats. In addition, according to the textbook, arrangers of this style during this ear used a technique call antiphony, or the trading of melodic figures between two different sections of the band.
