Much of Queen's 1973 self-titled debut appears to have been erased from the rock giants' remarkable history. It's conspicuous by its absence on Greatest Hits, the 1981 compilation that remains the U.K.'s best-selling album ever. The Adam Lambert incarnation has only ever played two of its songs. And in one of many, many examples of revisionism, the Bohemian Rhapsody film would have you believe their first recorded effort was their second album's closer "Seven Seas of Rhye." And yet, it's a vital first chapter of Queen's story — one which laid the groundwork for all of the genius, and indeed chaos, that was to follow.

Celebrating its 50th anniversary on July 13, Queen derived from a five-song demo frontman Freddie Mercury, guitarist Brian May, bassist John Deacon and drummer Roger Taylor had shipped around numerous labels the year previously. Charisma Records was the only one to bite. But as the home of the already-established prog rockers Genesis, the band reportedly believed they wouldn't get the attention they required and turned the offer down.

Queen did, however, forge a connection with John Anthony, the producer of Genesis' second LP Trespass, and his Neptune Productions co-founder Roy Thomas Baker. The pair subsequently guided sessions at the same Trident Studios whereThe Beatles, a particular favorite of May's, had laid down "Hey Jude." But unlike the Fab Four, Queen were only allowed to record out-of-hours, an arrangement that Taylor laterrevealed in 2011 documentary Days of Our Lives wasn't always conducive to full concentration: "You could see the working girls at night through their laced curtains, so while we were mixing, we would have a little bit of diversion."

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Like any young band, Queen took a while to nail things. Opener "Keep Yourself Alive," one of the album's few songs to enjoy a healthy shelf life, had to be re-recorded eight times before a mix by longtime engineer Mike Stone finally achieved the band's approval. "Mad the Swine" was discarded completely due to conflicting opinions over its rhythm, only later showing up as a 1991 B-side. And the atmosphere between the group and Baker was continually fraught, with May later remarking, "We were fighting the whole time to find a place where we had the perfection, but also the reality of performance and sound."

Queen's teething problems didn't subside once they waved goodbye to the studio. Once again, the group struggled to attract any major label interest. In fact, it took eight months for their debut to find a home: it was eventually issued by Trident Studios via a licensing deal with Elektra Records in the States and EMI in the U.K. The former's founder, Jac Holman, certainly made up for the lack of enthusiasm elsewhere, though, declaring in a 1972 memo to his staff, "I have seen the future of pop music, and it is a band called Queen."

Unfortunately, by the time the record eventually hit stores the next year, the band themselves believed that, far from forward-thinking, it was already something of a relic. Speaking to Guitar magazine just weeks later, a disillusioned May remarked, "Most of the songs were written about three years ago. We just feel that, as a band, we've gone past what's on the album. We put it down in order to progress to different things." Within a month, Queen had returned to Trident Studios to start work on its follow-up.

Luckily, the reaction outside the band was less fatigued. Although it hardly set the charts alight, peaking at No. 83 on the Billboard 200 and No. 32 on the UK album chart, Queen sold steadily enough to achieve gold status. A headlining national tour which began, rather appropriately, at Basingstoke's Queen Mary's College and a support slot with Mott the Hoople also helped to spread the word.

And the press instantly latched onto a band whose mission statement, as Mercury told Melody Maker, was to instantly shock: "We don't want people to have to think of [whether] they like us or not, but to formulate an opinion the moment they see us." In one of the album's more rhapsodic reviews, Rolling Stone declared "this funky, energetic English quartet has all the tools they'll need to lay claim to the Zep's abdicated heavy-metal throne, and beyond that to become a truly influential force in the rock world."

Those only familiar with the group's crowd-pleasing stadium anthems may be surprised to hear of comparisons with Led Zeppelin and talk of heavy metal. But the Queen of 1973 was a different beast to the Queen that conquered Live Aid. Their eponymous debut is indeed a place where the riffs are thunderous, tempos are forever shifting and lyrical themes are grounded in the mystical and medieval. There's little here to inspire mass singalongs a la "We Will Rock You" or "Don't Stop Me Now."

For a band in their infancy, the sense of ambition is remarkable — yet as they'd prove throughout their career, hardly an outlier. Plucked from May and Taylor's former band, Smile, "Doing All Right" lurches from prog and folk to proto-metal with aplomb. With galloping rhythms, acoustic breaks and an interpolation of nursery rhyme "Old King Cole," the baroque and bizarre "Great King Rat" contains more ideas in its near-six minutes than many of their peers managed in their entire discographies; "Jesus" celebrates Christ's power to cure the sick over a marching beat and swirling guitars that border on the psychedelic.

As signified by the album's artwork — a purple-tinted spotlight glaring solely on their arms-outstretched frontman — Mercury is undoubtedly the star of the show. Not only does he co-write half the 10 tracks, he takes nearly all the main vocal duties, too, and even gets to debut his piano skills on "My Fairy King." This Tolkien-esque saga ("Ah, then came man to savage in the night/ To run like thieves and to kill like knives") also introduced the fantastical world of Rhye that would be explored further in Queen's commercial breakthrough.

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However, Mercury's bandmates still get the chance to shine. You're never more than 30 seconds away from May attempting to emulate the overdubbed theatrics of his guitar hero Jimi Hendrix, like on "Son and Daughter. " He was so keen to prove his six-string wizardry was the real thing, he insisted in Queen's  liner notes that "nobody played synthesizer."

It's May's solo compositions that are the album's most accessible. The propulsive opener "Keep Yourself Alive" hints at the band's excessive tastes ("Well I've loved a million women/In a belladonic haze/And I ate a million dinners/Brought to me on silver trays," Mercury sings on the second verse); "Night Comes Down" is an introspective coming-of-age tale with a lyrical nod to the Beatles' "Lucy in the Sky with Diamonds."

Setting the template for every future Queen album, Taylor grabs a lead vocal on "Modern Times Rock 'N' Roll," a short but fast burst of pre-punk that takes aim at the state of the early '70s music industry. And while Deacon's basslines are generally buried a little deeper into the mix, they come to life on "Liar," a full-throttle confessional where Mercury tries to atone for some undisclosed sins.

Although Queen were keen to move on from their debut, its follow-up still had several ties. Despite their previous creative differences, Baker returned to the production fold, as he would for the band's subsequent two releases. And it also closed with "Seven Seas of Rhye," the original brief instrumental in Queen that was expanded to a full vocal-led version — and  wound up becoming the band's first notable hit in 1974.

And over time, the group appeared to recognize Queen's merits. "Keep Yourself Alive," "Seven Seas of Rhye" and "Liar" all returned to setlists during their stadium tour phase. And in 2011's 40 Years of Queen book, May acknowledged that the LP possessed two qualities lacking elsewhere in their oeuvre. "That album had the youth and freshness which was never regained, because you're only young once," he wrote. "I would never think of going back and redoing it, or anything like that, because I think it has a freshness we won't have again."

Indeed, Queen might not have the same stature as A Night at the Opera, News of the World or any of the other four studio efforts that positioned Mercury and Co. as the true champions of '70s rock. But in allowing the band to explore and develop their love of the grandiose, it was an undeniably pivotal stepping stone for one of rock's game-changing groups.

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