It is a unique mix of great vocals with a more rocking, bluesy, and jazzy quasi-mainstream song-themed balladic thrust…

Returning to Gentle Giant's fourth album after any kind of lengthy absence, it's astonishing just how little Octopus has dated. Often written off at the time as a pale reflection of the truly gargantuan steps being taken by the likes of Jethro Tull and Barclay James Harvest, the band's closest relatives in the tangled skein of period prog, Gentle Giant often seemed more notable for its album art than its music. Octopus, however, marries the two seamlessly, with the cover speaking for itself, of course…

In 1992, Manfred Mann's Earth Band in its latest incarnation delivered a new album that retraced a few earlier steps and got closer to finishing some ideas that earlier incarnations of the band had begun. The result was Masque, a strange and beautiful (and strangely beautiful) mix of jazz, rock, classical, and pop sounds, drawing on compositions from Paul Weller to Gustav Holst…

Mike Oldfield was back into the extended composition game with Five Miles Out, continuing the "Taurus" series with the mammoth "Taurus II," an entertaining enough romp with references to Irish music, brass bands and Oldfield's beloved Morris…

The instrumental Time Is the Key ushers Moerlen's Gong into the new age. A lighter version of their previous release, Downwind, the band plays mostly progressive rock-based compositions with a drastically different personnel. Peter Lemer's keys, coupled with the sound of vibes and electravibe in particular, give the music a generic, new age sound at times…

Not only is 1981's Moving Pictures Rush's best album, it is undeniably one of the greatest hard rock albums of all time. The new wave meets hard rock approach of Permanent Waves is honed to perfection – all seven of the tracks are classics (four are still featured regularly in concert and on classic rock radio). While other hard rock bands at the time experimented unsuccessfully with other musical styles, Rush were one of the few to successfully cross over…

This album was the debut of Uriah Heep, an English band that would become one of the Titans of the '70s heavy metal sound. Despite their eventual hard-rocking reputation, Very 'Eavy… Very 'Umble finds the band trying on different stylistic hats as they work towards finding their own sound…

Moments of Genesis are as spooky and arty as those on Abacab – in particular, there's the tortured howl of "Mama," uncannily reminiscent of Phil Collins' Face Value, and the two-part "Second Home by the Sea" – but this eponymous 1983 album is indeed a rebirth, as so many self-titled albums delivered in the thick of a band's career often are. Here the art rock functions as coloring to the pop songs, unlike on Abacab and Duke, where the reverse is true…

Lest the momentum of Moroccan Roll and its relative chart success go to waste, Brand X released a stopgap solution with Livestock, featuring three recent live tracks and two stockpiled studio tracks that actually predate the Moroccan Roll sessions by two months…

On Steve Hillage's 1978 release Green, the underground prog rock fan favorite issues more of his trademark thinking-man's music. Fans of mid- to late-'70s Pink Floyd will want to check this album out, since it possesses many of the same musical qualities, due to the fact that it was produced by Floyd drummer Nick Mason, along with Hillage…