Johan Sebastian Bach's music has enjoyed considerable longevity as a cornerstone of the musical zeitgeist, but his personal life is, for the most part, the stuff of speculation. The composer's little known personality—his emotions, flaws, and triumphs—may be about to become significantly clearer, however, with the publication of Bach: Music in The Castle of Heaven. Written by John Eliot Gardiner—himself a renowned composer—the book attempts to unravel a man "filled with contradictions". NPR Music's Tom Huizenga recently sat down with Gardiner for a chat about his new book—you can read it here.