Fifty years ago, The Beatles released “Lucy in the Sky with Diamonds,” a song that would go on to become one of their most famous in music history. On Thursday, NPR Music released the first take of that song, in which The Beatles test out their original conception of the song at the Abbey Road Studios in London. In what would ultimately take four days, the band rehearsed, tweaked, and refined the song until it arrived at the version we all know and love today, “All Songs Considered” host Bob Boilen reports. While most assumed then, and continue to assume now, the song has to do with acid-fueled hallucinations, Boilen writes John Lennon actually had his then 3-year-old child in mind when crafting the lyrics. Apparently, as Lennon once described in an interview with Dick Cavett in 1971, Lennon’s son had made a painting of a classmate and gave it the title, “Lucy in the sky with diamonds.” So much for hidden acronyms.

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