Ummagumma was their first.

Yes. Pink Floyd’s first double album was Ummagumma, released in 1969. It’s half live, half studio — a bit of a mess, honestly, but that’s where it started.

The band had done single albums before that: The Piper at the Gates of Dawn, A Saucerful of Secrets, and More (a soundtrack). Then they decided to stretch out and give you a live disc and a solo-experiment studio disc. It sold well, but it’s more of a historical curiosity than a great listen.

The Wall gets all the double-album glory, but Ummagumma beat it by a decade. You can skip it unless you’re a completionist.