Lets go, Utauyo miracle, U and I, Tenshi ni Fureta yo - all by hokago tea time
Since youve been gone - Rainbow
Iron man, Paranoid - Black Sabbath
Cliffs of Dover - Eric Johnson
Pretty much anything by monty python as well as the song `the song that goes like this from spamalot
Lots of Benny Hill songs or indeed any good comedic song
Nyan cat - I dont like it but it makes me laugh when others are around because it usually drives people nuts (which cheers me up in an indirect way).
Crazy Train - Ozzy Osbourne
God gave Rock and roll to you - Kiss version
Quite a few songs from Ar Tonelico 2 especially the one in the market place sorry they have weird names and I cant remember them.
Yeah lots of songs cheer me up even though I dont listen to an awful lot of music.