One L And The Big J

I'm not going to get too sentimental, like those other sticky valentines. I was in San Diego, not far from here, when I first heard "Alison" in 1976. It's one of those songs. Elvis Costello, shown performing in 2003, won't say who it's about. If you have any doubt about the underlying emotion, listen for the song he twins it with.
Hat tip to No Depression