Aphrodite's Child was a Greek singles group that had some success in the UK; but more importantly, they spawned two of Greece's greatest musical exports, singer Demis Roussos and composer/performer Vangelis Papathanassiou. By the time their seminal 666 (The Apocalypse of John, 13/18) was released, the beat era and any pop legacy were all behind them. Based on the Book of Revelation, the double-album was recorded in Paris, from late 1970 to early 1972.

Khan was the brainchild of Steve Hillage. Previously in Uriel (aka Arzachel), the guitarist went off to complete his studies at the University of Kent in Canterbury, where much of the album was subsequently written. Gaining support from Caravan's manager Terry King, he formed Khan in 1971, with Nick Greenwood (ex-The Crazy World of Arthur Brown) on bass and Eric Peachey on drums. Dave Stewart replaced original keyboardist Dick Heningham just prior to recording Space Shanty, their first and only album.

Uriah Heep, named after the Charles Dickens character, was one of the more critically-derided bands of the era. The classic quote is this: "If this band makes it, I'll have to kill myself" (Rolling Stone, Melissa Mills, 1970). Sadly, a few of the members did pass away too early: New Zealander Gary Thain in 1976, while David Byron (born David Garrett) died in 1985. Lead singer Byron and guitarist Mick Box had previously been in the Essex-based band The Stalkers, which mutated into Spice in 1967.

Formed in 1970, Hoelderlin initially occupied a unique space in German rock music, combining the influences of British folk with musical romanticism—obviously, a nod to their namesake, the 19th century German poet Friedrich Hölderlin. Formed in Wuppertal, the core of the band included the von Grumbkow brothers, Christian and Joachim, and Christian's wife, Nanny de Ruig, on vocals.

Matching Mole was Robert Wyatt's post-Soft Machine group, its name a play on the French translation of Soft Machine, "machine molle." Wyatt first managed to draw keyboardist and fellow Cantabrian Dave Sinclair from Caravan, then continued to recruit a first-rate band: bassist Bill MacCormick was previously in Quiet Sun and guitarist Phil Miller came from Delivery, while Nucleus' pianist David MacRae rounded out the lineup as a second keyboardist.

Caravan's fourth album was a bit of a departure: Richard Sinclair brought in new keyboard player Steve Miller, previously in Delivery, to "jazz" up the Caravan sound. "Waterloo Lily," a song about a heavy-set hooker, would be one of the last songs Sinclair would sing with the band. It's a simple number, but Miller's extended electric piano solo signals the change.

In protest over the misconception of Aqualung (he claimed it wasn't a concept album), Ian Anderson delivered what might be the mother of all concept albums: the wryly-titled Thick As A Brick. Based on a "poem written by eight-year-old Gerald Bostock and set to musical accompaniment by rock group Jethro Tull," the album contains a single "song" spanning both sides of the vinyl. So much for the approach pioneered on Aqualung!

The Strawberry Hill Boys were a bluegrass trio founded by Dave Cousins, Tony Hooper and Ron Chesterman in 1967. Sandy Denny briefly passed through the band, recording an unreleased album (1973’s All Our Own Work) before joining Fairport Convention. In 1969 the band shortened their name and landed a recording contract with A&M. The Strawbs recorded two early albums with production heavyweights Gus Dudgeon and Tony Visconti, respectively. In 1970, Chesterman left, and Cousins and Hooper added the rhythm section of John Ford and Richard Hudson.

English progressive rock was hugely popular in Italy during the early 70s, so it was only a matter of time before the Italians themselves decided to create progressive music as well. Premiata Forneria Marconi ("Award Winning Marconi Bakery") were at the forefront of this movement. Originally the beat group I Quelli, the members had enjoyed relative success in Italy as both a support band for others and as session musicians.

Ex-Yes guitarist Peter Banks was enlisted for a (very) short stint in Blodwyn Pig before forming Flash. True to their name, Flash appeared quickly, released three albums for Capitol Records and vanished. Banks recruited vocalist Colin Carter, bassist Ray Bennett and drummer Mike Hough, with ex-Yes keyboardist Tony Kaye filling in on their debut.