When It Rains is an instrumental jazz composition by Brad Mehldau. It appears on the 2002 album Largo, with the track recorded April 2-8, 2001 in Hollywood, California. The piece pairs Mehldau’s piano with wind orchestration and an acoustic ensemble, including bass, drums, flute, oboe, clarinet and bassoon. The piano introduction is joined by the winds and Mehldau’s droning left-hand triplets evoke rain, yielding a lonesome yet ultimately optimistic mood, and the piece ends with a solo reprise of the introduction. Some drumming features 3-over-4 polyrhythms, and the track was released by Warner Bros and produced by Jon Brion.