What do you do with the songs you can't play anymore?

I've got a playlist of tracks I've retired from the wedding circuit because something happened while one of them was playing — a father-daughter dance where the father wasn't there, a request that came with a story I wish I didn't know. I can't bring myself to delete them, but I also can't listen to them in the car anymore. Does anyone else hold onto things like that, or am I just carrying extra weight?