Obscured by Clouds is the soundtrack to the Barbet Schroeder film La Vallée, and it plays that way. Of course, it's possible to make the argument that Pink Floyd's music of the early '70s usually played as mood music, similar to film music, but it had structure and a progression…

Lindsey Buckingham hadn't recorded a studio album with Fleetwood Mac in 16 years when Say You Will was released in April 2003. His partner, Stevie Nicks, had been missing in action from the group since 1990, and while both joined the reunited group in 1997 for a tour and live album (The Dance), not to mention Bill Clinton's 1993 inauguration, it had been a long, long time since the two made new music for the Mac…

One of the great concept albums by one of the great prog rock acts, Thick as a Brick found Jethro Tull making a big splash with the monolithic, one-track juggernaut of an album. Revisiting that classic work, frontman Ian Anderson takes to the stage in Iceland, performing the album, as well as its 2011 sequel, Thick as a Brick 2, in front of a live crowd on Thick as a Brick: Live in Iceland…

Its smirky title notwithstanding, The Worst of Jefferson Airplane provides a fine recap of the band's first six albums. Released in 1970 shortly before Marty Balin's initial departure from the band, the album marked not only the end of the decade but, unwittingly, the end of the group's most stable phase in terms of membership. The track selections are evenly divided among the first-generation albums; only the live Bless Its Pointed Little Head is represented by a single entry…

Jefferson Airplane's first live album demonstrated the group's development as concert performers, taking a number of songs that had been performed in concise, pop-oriented versions on their early albums – "3/5's of a Mile in 10 Seconds," "Somebody to Love," "It's No Secret," "Plastic Fantastic Lover" – and rendering them in arrangements that were longer, harder rocking, and more densely textured, especially in terms of the guitar and basslines constructed by Jorma Kaukonen and Jack Casady…

Although Free was never destined to scrape the same skies as Led Zeppelin, when they first burst out of the traps in 1968, close to a year ahead of Jimmy Page and company, they set the world of British blues-rock firmly on its head, a blistering combination of youth, ambition, and, despite those tender years, experience that, across the course of their debut album, did indeed lay the groundwork for all that Zeppelin would embrace…

Mike Harrison is the first solo album by Spooky Tooth principal lead singer Mike Harrison, released on Island Records in 1971.

Jethro Tull was very much a blues band on their debut album, vaguely reminiscent of the Graham Bond Organization only more cohesive, and with greater commercial sense. The revelations about the group's roots on This Was – which was recorded during the summer of 1968 – can be astonishing, even 30 years after the fact…

Crown of Creation appeared ten months after their last album, After Bathing at Baxter's, and it doesn't take the same kind of leap forward that Baxter's did from Surrealistic Pillow. Indeed, in many ways, Crown of Creation is a more conservative album stylistically, opening with "Lather," a Grace Slick original that was one of the group's very last forays (and certainly their last prominent one) into a folk idiom. Much of what follows is a lot more based in electric rock, as well as steeped in elements of science fiction (specifically author John Wyndham's book The Chrysalids) in several places, but Crown of Creation was still deliberately more accessible musically than its predecessor, even as the playing became more bold and daring within more traditional song structures…

Roger Waters was Pink Floyd's grand conceptualist, the driving force behind such albums as Dark Side of the Moon, Wish You Were Here, and The Wall. In the wake of Syd Barrett's departure, Waters emerged as a formidable songwriter, but it's this stretch of '70s albums – each one nearly symphonic in its reach – that established him as a distinctive, idiosyncratic voice within rock and, following his departure from Floyd in 1985, he continued to create new works in this vein (notably, 1992's Amused to Death) and capitalized on the enduring popularity of his old band by staging live revivals of Dark Side of the Moon and The Wall in their entireties…

If's last studio album isn't as good as their first albums. After many line-up changes, the band slowly changed their musical direction to more straightforward blues-soul-rock…