Yes’ “Perpetual Change” is a wonder of polyrhythms, poetic lyrics, tight harmonies, elegant keys and sometimes melodic, always innovative guitar.

Tony Kaye was on the way back from a Yes performance at Basingstoke in 1970, when the band was involved in a horrific crash.

Released this week in 1971, ‘The Yes Album’ was their big-bang moment, a project where the full scope of Yes’ genius began to take shape.

Preston Frazier discusses Billy Sherwood’s best contributions to prog and pop, both with Yes and with stars like Paul Rodgers and William Shatner.

A Yes pre-cursor group, Mabel Greer’s Toyshop has returned — with a whole new set of connections to the legendary prog amalgam.

Trevor Horn, Jon Anderson and Tony Kaye join us to discuss Yes’ “Owner of a Lonely Heart,” issued as a single in October 1983.

Badfinger had endured its share of bad luck before April 24, 1975, to be sure. But everything changed on that awful day, when Pete Ham — singer and composer of so many of their hits — committed suicide.

A primer on Yes alum Billy Sherwood’s subsequent solo career, including work with ex-bandmate Chris Squire and with Circa.

A new prog-rock project from William Shatner has already garnered headlines for its collaborations with former members of Yes. Ponder the Mystery also includes final recordings with the late George Duke.

Arriving in a period in which Yes wasn’t doing studio work, and including contributions from no less than five musicians with ties to the band, the comparisons for Circa came early and often. A new reissue from Cleopatra underscores the differences.