Chris Squire, the co-founder of the progressive rock band Yes passed away on Saturday at the age of 67. Squire had been battle leukemia. "It's with the heaviest of hearts and unbearable sadness that we must inform you of the passing of our dear friend and Yes co-founder, Chris Squire," read a message posted on the group's Facebook page on Sunday. "Chris peacefully passed away last night in Phoenix, Arizona." He is survived by his wife and five children. Squire was born in London in 1948 and formed the band in 1968 with singer Job Anderson. He co-wrote some of their best known hits, including "Owner of a Lonely Heart," "Leave It" and "Lift Me Up.” He revealed his leukemia diagnosis last month.