India, Dec. 28 -- M usic was already a big part of my life in 1975. I had my father's Western classical music LPs, and Beatles, Rolling Stones and Doors records borrowed from luckier friends in Calcutta. But at 16, I didn't fully grasp what that year was giving the world. I came to the best 1975 albums only years later, in moments that often involved personal revelations. As this year ends and these masterpieces turn 50, I find myself returning to them with something more than nostalgia. With gratitude. This was a phenomenally generous year. It gave us Bob Dylan's Blood on the Tracks, a meditative introspection that blends acoustic back into the electric; a work so deeply personal that it seemed to anticipate the confessional era of song-wr...