Drumming is one of Steve Reich’s most important and influential compositions, a percussion work that is played by anywhere from 9 to 12 musicians and that can last between an hour and 90 minutes, depending on the choices of the musicians. It is built on a single long rhythmic phrase that is first built up one note at a time, and then changed over the course of the work as different musicians play the pattern in and out of phase with each other. The result is a shimmering and pulsating mass of sound that constantly changes while also staying very much the same.