Yes bassist Chris Squire has passed away, according to Yes bandmate Geoffrey Downes. Squire was 67. The bassist had been undergoing treatment for acute erythroid leukemia in his adopted hometown of Phoenix.

Born in London in 1948, Squire formed Yes twenty years later and remains the only musician to have played on every one of the band’s records. The band was set to head out on tour with Toto beginning in August with a replacement bassist while Squire received treatment for his illness.

Squire sat down with Jambands.com in 2012 to discuss the band’s tour in which they performed three of their groundbreaking albums in their entirety. Read the full interview here.