The Rolling Stone received perhaps the most sustained standing ovation of the night as he joined his old pal toward the end of Crossroads, a two-night concert festival at Madison Square Garden that brought together a dazzling array of guitar masters, from John Mayer to Jeff Beck to legends like Buddy Guy, and of course, Clapton and Richards.

Richards ' whose Stones announced another tour earlier this month ' flashed his typical wry smile to the crowd before joining Clapton in playing the blues standard and Clapton favorite 'Key to the Highway'.

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'Now we're gonna rock it up,' Richards said before launching into 'Sweet Little Rock N' Roller'.

The Crossroads Guitar Festival, which benefits Clapton's Crossroads Center for substance abuse in Antigua, has been held every three years since 2004; this Friday and Saturday was its first at Madison Square Garden.

The show lasted almost five hours, with each performer showcasing his own particular brand of wizardry on the instrument (all the headliners were men, though there were a few women as supporting players in the program).

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