For those unfamiliar with the format, a flexidisc was a 7inch record pressed on very thin plastic. The sound quality was rubbish to start with, even before it picked up the creases inevitable to such a thin item, but it was enough to give the listener a decent enough clue to the music, and it was cheap and light making it ideal for give-aways.
One such give-away was the flexi that came with the 29th April 1972 edition of New Musical Express.
On one side was some tosh by Curved Air and something called Blind Alley by Fanny, whoever the hell they were. It's the stuff on the other side we're concerned with.
Two weeks before the release of Exile On Main Street, here were excerpts of four tracks (All Down The Line, Tumbling Dice, Shine A Light and Happy), linked by a track called Exile On Main Street Blues. This song is a slow piano boogie with Jagger singing a lyric that strings together a load of the titles of the album tracks. It's a great little oddity, and as far as I know it's never been officially reissued anywhere.
I've put up two MP3s - one's the full flexi, and on the other I've cut out the album tracks so it's a splicing together of Exile On Main Street Blues on its own.
[MP3s deleted to make room for new ones. Sorry!]