Few American artists have captured painters imaginations with the gripping force of Albert Pinkham Ryder (1847-1917). The brooding spirituality of his works, coupled with formal innovation decades ahead of its time, have long made Ryder a favorite of innovators like Jackson Pollock, Marsden Hartley, and Robert Rauschenberg. And yet, the artist's biography and practices remain elusive. A Wild Note of Longing whose title is taken from a Ryder poem--takes...