Richard Wright, right, wrote or co-wrote many of the bands songs, and frequently provided a crucial component of the Pink Floyd sound. On Dark Side of the Moon, Wright was responsible for the thick electric piano chording on the 1973 hit Money as well as the swirling organ lines and classically inspired grand piano on Us and Them. At left is singer-guitarist David Gilmour. (Patrick Hertzog / AFP / Getty Images)
