I was on the point of sending a copy of "Pack Up Your Sorrows" in email to a friend to cheer her up, but took a good look at the lyrics. Apart from the fact that it didn't actually look all that cheering, I didn't really understand it.
"The Mary Ellen Carter" is more my style. It's gotten me through a lot of bad times. OK, it's not exactly cheerful -- defiant is more like it -- but it's cheering.
What songs cheer you up?
added 9:35am I also meant to add "Desolation Row". Obscure, sure, but snidely funny and greatly cheering in a "things are rotten here, but what the hell, it's home" sense.