We’re sad to report that Yes bassist Chris Squire has passed away at the age of 67. The co-founder of the band was also the only member to appear on every Yes studio album, laying down melodic bass lines on albums dating back to 1969. He is a profound influence to any musician, and his signature triple-necked bass was an iconic feature of the band’s live shows.

The band posted the following message, confirming the unfortunate news:

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. Chris peacefully passed away last night in Phoenix Arizona. We will have more information for you soon.

With such a lengthy career, Yes saw many personnel changes throughout the years. Squire remained the band’s rock, ensuring that the enduring progressive band remained true to their distinct sound. He was involved in songwriting on some of the band’s most recognizable songs, “I’ve Seen All Good People”, “Yours Is No Disgrace”, “Owner of a Lonely Heart”, and so many more.

Squire was diagnosed with acute erythroid leukemia earlier this year, and he announced back in April that he would not be joining Yes on tour for the first time in decades. At the time, he said in a statement, “This will be the first time since the band formed in 1968 that Yes will have performed live without me… But the other guys and myself have agreed that Billy Sherwood will do an excellent job of covering my parts and the show as a whole will deliver the same Yes experience that our fans have come to expect over the years.”

Our hearts go out to Squire and his loved ones. RIP.