Dylan, without question. I continue to be shocked by the sheer number of great songs he has penned, many of which were made "hits" by other artists (hell, some artists built their careers largely on the back of Bob tunes).
Garcia-Hunter deserve mention, I'd say. And back to Dylan, look for a release of Dead do Dylan in the not-too-distant. The boyz covered about a dozen of his songs independent of their joint tour.
Beatles, Leonard Cohen, Joni Mitchell, maybe Bacharach-David, Jimmy Webb (too schmaltzy for many, but I love it). Springsteen, definitely. Thunder Road gets my vote for greatest rock song.
