Eric Clapton brought together over 30 musicians for the latest edition of his Crossroads Guitar Festival at New York's Madison Square Garden.<br/> <br />The two-day concert benefited Clapton's drug and alcohol treatment facility in Antigua.<br/> <br />Guitar legends and those in the making answered Clapton's call to play for the festival.<br/> <br />Country star Keith Urban teamed up with John Mayer, while the Rolling Stone's Keith Richards was the second night surprise guest.<br/> <br />Other key performers who hit the stage were B.B. King, Brad Paisley, The Allman Brothers and many more.