We lost another one a few days ago. By “we,” I mean people who like good music, and by “another one,” I mean, of course, Tom Petty. All this week, every time I’ve had the chance, I’ve been listening to his music, whether on Pandora or my own digital collection. I’ve been reading tributes from his friends and fellow musicians, and I’ve been commiserating with my friends over our loss. For some reason, this one’s been tougher than most. My earliest musical memory of Petty is “The Waiting,” the first song from what would eventually become my second-favorite Petty album, Hard Promises. My memory isn’t of the first time I…