When I was looking to join a band a few years ago, I put an ad on Craigslist explaining that I had played bass for a while and describing my musical background. Then, since I felt that I wasn't really communicating all that much about myself or where I was coming from, I quickly put down that if I could have written any song, I would have wanted to have written The Promise Ring's "Red and Blue Jeans." It was off the cuff, but I thought it over and felt it was appropriate. I've listened to a lot of music since then and my tastes have certainly changed, so I'm not going to say that this is the hands-down choice, but I'm not so sure I'd change my answer either.

Promise Ring - Red & Blue Jeans