Exclusive Interview: Sara Bareilles

Credit: Eric Helton, Matthew Murphy
The singer-songwriter visits the Rolling Stone offices to talk about how she overcame writer's block to record her smash new album, Kaleidoscope Heart. Plus: The Full story of Bareilles' visit to the White House to play "Love Song" for the Obamas, and the top-secret advice she received from Pharrell Williams of N.E.R.D.