Which 1967 The Who album was conceived as a concept album about a pirate radio station?

The 1967 The Who album conceived as a concept album about a pirate radio station was The Who Sell Out.

The album was designed to resemble a broadcast from Radio London, one of the offshore pirate stations that supplied British listeners with pop music the BBC largely avoided. Instead of presenting only a continuous sequence of songs, The Who Sell Out mixes original tracks with mock commercials, station jingles, and public-service announcements. The interruptions make the record sound like a complete radio transmission.

The concept was especially meaningful to The Who because pirate radio had been influential among the mod audience that helped establish the band. Managers Kit Lambert and Chris Stamp suggested the idea in 1967, while Pete Townshend, Kit Lambert, and Richard Barnes each received credit in different accounts for developing it.

The album's title was deliberately ironic. The Who had made real advertising recordings, so the fake commercials played with accusations that the band was commercially compromising its art. Released in the United Kingdom on 15 December 1967, it became the band's third studio album and included “I Can See for Miles,” their biggest US hit.