This week In One-Off Collaborations 42/52
How well do you know the music of Flea & Nirvana, Eddie Van Halen & Sheryl Crow, Keith Richards & U2, John Mayer & Eric Clapton, Lee Ritenour & Steve Lukather, Steve Cropper, Robert Cray & Dave Edmonds, Elton John & Leon Russell, Lauryn Hill & Ziggy Marley, Wyclef Jean & Destiny's Child, Donna Summer & Seal, Jack Bruce & Friends, John Legend & Esperanza Spalding ? Take our 12-track quiz.

