Album: Between The Buttons
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According to one of my sources for this insanity, the comprehensive if indifferently written The Rolling Stones All The Songs: The Story Behind Every Track by Philippe Margotin & Jean-Michel Guesdon, “Connection” is the first song where Keith Richard sings lead, which — given how close Mick is singing with him — is almost a distinction without a difference.
That said, ever since the X-pensive Winos tours in the late 1980s, Keith has essentially claimed “Connection” as one of his quintessential songs, like “Happy” or “Before They Make Me Run,” and given how much it foreshadows his future, it totally makes sense.