Few debut albums have altered the course of rock to the extent that Are You Experienced, the full-length bow from the Jimi Hendrix Experience, did in the spring of 1967. First released in the U.K. – a version with a different track selection and running order would be issued in the U.S. three months later – the LP not only showcased Hendrix’s remarkably inventive guitar playing, but also combined R&B, blues, psychedelia, pop, heavy rock and even jazz in a way that no one had ever done (or even imagined) before. Are You Experienced also revealed Hendrix (a veteran of the “chitlin’ circuit” who’d been all but unknown to rock fans a year earlier) as a songwriter with a uniquely whimsical and imaginative lyrical vision, one which could leap from earthy lust to futuristic fantasy with just a handful of words.

Featuring such immortal tracks as “Foxy Lady,” “Fire,” “Love or Confusion,” “Are You Experienced?” and “Manic Depression,” the album – especially the U.S. edition, which also included the U.K. singles “Hey Joe,” “Purple Haze,” and “The Wind Cries Mary” – is practically a greatest-hits record unto itself. Hendrix, however, was just getting started; on his next two albums, 1967’s Axis: Bold As Love and 1968’s Electric Ladyland, he would paint sonic canvases so colorful and detailed as to make Are You Experienced seem raw and primitive by comparison. “Are You Experienced was one of the most direct records we’ve done,” he told Hit Parader magazine in January 1969. “What it was saying was, ‘Let us through the wall, man, we want you to dig it.'” And dig it, they did: Are You Experienced went on to spend 106 weeks on the Billboard 200, eventually selling more than 5 million copies in the U.S. alone.

To celebrate the landmark album here are some lesser-known facts about Are You Experienced.

1. The Jimi Hendrix Experience had only been together for a few weeks before recording.
On October 23rd, 1966, Hendrix, Redding and Mitchell entered London’s De Lane Lea studios to record a soulful cover of Billy Roberts’ folk-rock standard “Hey Joe” with manager Chas Chandler producing. Released seven weeks later as a single, the recording – which would be included on the U.S. version of Are You Experienced – climbed all the way to Number Six on the U.K. charts, establishing Hendrix as a rising star in Britain and Europe. Incredibly, Hendrix had only just arrived in London on September 24th, hooked up with Redding on the 29th, and auditioned Mitchell on October 4th; nine days after Mitchell joined the band, the Jimi Hendrix Experience played their first-ever gig at the Novelty cinema in Évreux, France, kicking off a four-date tour opening for French pop singer Johnny Hallyday.