Al Kooper, by rights, should be regarded as one of the giants of '60s rock, not far behind the likes of Bob Dylan and Paul Simon in importance. In addition to co-writing one classic mid-'60s pop-rock song, "This Diamond Ring" (though it was written as an R&B number), he was a very audible sessionman on some of the most important records of mid-decade, including Bob Dylan's "Like a Rolling Stone." Kooper also joined and led, and then lost two major groups, the Blues Project and Blood, Sweat & Tears. He played on two classic blues-rock albums in conjunction with his friend Mike ...