Once upon a time I was falling apart. Now I'm always falling in love. Pick up the microphone. When Rob Sheffield moved to New York City in the summer of 2001, he was a young widower trying to start a new life in a new town. Behind, in the past, was his life as a happily married rock critic, with a wife he adored, and a massive collection of mix tapes that captured their life together. And then, in a flash, all he had left were the tapes. Beyonc...