Rolling Stones unreleased: I’m Yours and I’m Hers
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Written by: Johnny Winter
Recorded: live in Hyde Park, London, England, July 5 1969
Also known as: ‘I’m Yours, She’s Mine’, ‘Lemon Squeezer’
Data taken from Martin Elliott’s book THE ROLLING STONES COMPLETE RECORDING SESSIONS 1962-2012

From Songfacts:
-Your song “I’m Yours and I’m Hers.” What do you remember about the writing of that?
Winter: I don’t remember exactly when I wrote that. Right before we recorded it, I think, in ’69. I don’t really remember a whole lot about writing that.

From Wikipedia:
Johnny Winter is Johnny Winter’s second studio album (where the song was originally included) Columbia Records released the album in 1969, after signing Winter to the label for a reported $600,000. As with his first album, The Progressive Blues Experiment, Winter mixes some original compositions with songs originally recorded by blues artists. The album reached number 24 on the Billboard 200 albums chart.
(Ref. rolling stones unreleased I’m yours and)