"But primarily, the drummer's supposed to sit back there and swing the band"

This quote by Buddy Rich is referring to the role of the drummer in a band. He is stating that the drummer needs to be the foundation of the band, providing the rhythm and the groove that the other musicians can play off of. He is highlighting the value of the drummer in the band, as they are the ones who are accountable for keeping the band in time and providing the energy and momentum for the other musicians to play off of. The drummer needs to be the one who is driving the band forward and keeping the music swinging. This quote is a reminder of the importance of the drummer in a band and how they must be the one to provide the structure for the other artists to build off of.