Philip Glass was approached by timpanist Jonathan Haas to write a timpani concerto for himself nearly ten years before Glass was finally able to get down to it. The timpani concerto ‘grew up’ into a double concerto fortwotimpanists and nine timpani in total, in three movements with a pair of cadenzas which are usually added onto the third movement. As is often the case with Glass’s music, this is a propulsive, noisy piece with someunusualperformance instructions, e.g. at one point the timpanis...