Live At Tower Theatre, Upper Darby, PA, USA 1987-11-25.

Each era of rock music has had its own craftily marketed phenomenon – it was the "live album" in the '70s, "unplugged" recordings in the '90s, and since the late '80s through the present day, the "tribute album." But the early 21st century saw another addition – veteran bands revisiting classic albums and performing them in their entirety. Jethro Tull's most enduring release is largely agreed to be 1971's classic Aqualung, and in late 2004 Ian Anderson, Martin Barre, and their latest Tull mates dusted off the album once more in front of a small audience for XM Radio's Then Again Live series. Since 33 years had passed between the original and the re-reading, the performances on Aqualung Live are slightly more restrained.

Minstrel in the Gallery was Tull's most artistically successful and elaborately produced album since Thick as a Brick and harkened back to that album with the inclusion of a 17-minute extended piece ("Baker Street Muse"). Although English folk elements abound, this is really a hard rock showcase on a par with – and perhaps even more aggressive than – anything on Aqualung. The title track is a superb showcase for the group, freely mixing folk melodies, lilting flute passages, and archaic, pre-Elizabethan feel, and the fiercest electric rock in the group's history – parts of it do recall phrases from A Passion Play, but all of it is more successful than anything on War Child.

Released just as punk was taking hold on the public's imagination in America and making groups like Jethro Tull seem like dinosaurs on their way to extinction, Bursting Out became a seemingly perpetual denizen of the cutout bins for years afterward. However, it happened to be a good album, a more-than-decent capturing of a live Tull concert from Europe. The sound is remarkably good, given the group's arena rock status at the time, and the repertoire is a solid representation of the group's history, going all the way back to "A New Day Yesterday" from their second album and up through 1978's Heavy Horses, with stops along the way for "Bouree," "Aqualung," "Locomotive Breath," "Cross-Eyed Mary," and a compact reprise of Thick as a Brick.

A Classic Case is an album by Jethro Tull, playing with the London Symphony Orchestra, released in 1985. The music was arranged and conducted by David Palmer, who had been a member of the group from 1976 to 1980. The album features band members Ian Anderson, Martin Barre, Dave Pegg and Peter-John Vettese. The album was recorded during the summer of 1984 at the CBS Studios in London. It was released on 31 December 1985 in the United States, where it reached #93 in the charts.

Despite its age, this collection remains the best introduction to the wonderfully bizarre sounds of Jethro Tull - a unique combination of folk music, progressive rock, heavy metal, and of course, Ian Anderson's ubiquitous flute. Drawing exclusively from the band's '70s heyday, opener "Living in the Past" sets the retrospective tone, leading the way into the signature guitar riff of "Aqualung," the band's multifaceted pièce de résistance. Though lyrically indecipherable, "Locomotive Breath" is equally timeless, and the moment when John Evan's fanciful piano intro gives way to Martin Barre's guitar feedback remains thrilling. With his acoustic guitar in hand, Ian Anderson becomes a medieval bard, drawing the listener into worlds of legend both threatening ("Sweet Dream," "Witches Promise") and joyously carefree ("Thick as a Brick," "Skating Away on the Thin Ice of the New Day")…

War Child was Jethro Tull's first album after two chart-toppers, Thick as a Brick and A Passion Play, and was one of those records that was a hit the day it was announced (it was certified platinum based on pre-orders, the last Tull album to earn platinum record status). It never made the impression of its predecessors, however, as it was a return to standard-length songs following two epic-length pieces. It was inevitable that the material would lack power, if only because the opportunity for development that gave Thick as a Brick and A Passion Play some of their power. Additionally, the music was no longer quite able to cover for the obscurity of Tull's lyrics ("Two Fingers" being the best example). The title track is reasonably successful, but "Queen and Country" seems repetitive and pointless…

Jethro Tull's second album-length composition, A Passion Play is very different from – and not quite as successful as – Thick as a Brick. Ian Anderson utilizes reams of biblical (and biblical-sounding) references, interwoven with modern language, as a sort of a rock equivalent to T.S. Eliot's The Wasteland. As with most progressive rock, the words seem important and profound, but their meaning is anyone's guess ("The ice-cream lady wet her drawers, to see you in the Passion Play…"), with Anderson as a dour but engaging singer/sage (who, at least at one point, seems to take on the role of a fallen angel). It helps to be aware of the framing story, about a newly deceased man called to review his life at the portals of heaven, who realizes that life on Earth is preferable to eternity in paradise.

The leap from 1970's Benefit to the following year's Aqualung is one of the most astonishing progressions in rock history. In the space of one album, Tull went from relatively unassuming electrified folk-rock to larger-than-life conceptual rock full of sophisticated compositions and complex, intellectual, lyrical constructs. While the leap to full-blown prog rock wouldn't be taken until a year later on Thick as a Brick, the degree to which Tull upped the ante here is remarkable. The lyrical concept – the hypocrisy of Christianity in England – is stronger than on most other '70s conceptual efforts, but it's ultimately the music that makes it worthy of praise.

Jethro Tull's best album of the 1990s, a surging, hard-rocking monster (at least, compared to anything immediately before or since) that doesn't lose sight of good tunes or the folk sources that have served this band well. The lineup this time out is Anderson on acoustic and electric guitars, flute, and electric and acoustic mandolins, Martin Barre on electric guitar, Doane Perry on drums, Dave Pegg on bass, and Andrew Giddings on keyboards. The real difference between this and most of the group's output since the end of the '70s lies in the songs, all of which are approached with serious energy and enthusiasm; the lyrics are completely forgettable, but for the first time since War Child, the band sounds like they're playing as though their lives depended on it.

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…

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…