Abbey Road.

Yes, it’s Abbey Road. “Because,” “Here Comes the Sun,” “Maxwell’s Silver Hammer”—those iconic sounds come from George Harrison’s Moog IIIp, which he personally brought to the studio in 1969.

Technically, the synthesizer had appeared on a few novelty records and film scores before that, but Abbey Road is rock’s first serious embrace of the Moog. Harrison had gotten one of the earliest units and spent weeks experimenting with it—sometimes to the band’s frustration (John called it “a load of noise”). But the tracks that made it onto the album proved it could do more than make spaceship sounds.

If you’re asking for pure trivia: the very first Beatles Moog moment was actually on “I Want You (She’s So Heavy),” recorded a few weeks earlier for the same album. Abbey Road still gets the credit.

The White Album had the Mellotron. Abbey Road had the future.