June 1, 1974 is a live album of songs performed at the Rainbow Theatre in London on the titular date. The album is officially attributed to all principal performers Kevin Ayers, John Cale, Brian Eno and Nico, although other well-known musicians, including Mike Oldfield, Robert Wyatt, and Ollie Halsall, also contributed to the concert. The record has often been referred to as the "A.C.N.E." album, for the initials of Ayers, Cale, Nico, and Eno.

The Rainbow Theatre, originally known as the Finsbury Park Astoria, then the Finsbury Park Paramount Astoria, and then the Finsbury Park Odeon, is a Grade II*-listed building in Finsbury Park, London. The theatre was built in 1930 as an "atmospheric cinema", to house entertainment extravaganzas which included a film show. It later became an ordinary cinema, then a music venue, as which it is best known, and then an occasional unlicensed boxing venue. Today, the building is used by the Universal Church of the Kingdom of God, an Evangelical church.