Nils Lofgren has a story unlike any other in rock & roll. Something of a teenage rock & roll prodigy, he first made waves when he played on Neil Young's After the Gold Rush at the tender age of 17, just around the time his D.C.-based band Grin relocated to Los Angeles in hopes of hitting the big time. Grin never became stars, but Lofgren did. His association with Young provided a launch pad for a solo career that was acclaimed and fitfully commercially successful, with the late-'70s albums Cry Tough, I Came to Dance, and Night After Night all making waves in album rock…