so called 'happy' music at best irritates, and at worst disgusts me. Almost everything listed in this thread seems to work on some sort of pathetic fallacy placebo idea, mindless pap and sugar.
The music that makes me happiest, well, gotta be Skyclad.
"Come one, come all to our travelling circus
Cast off your cares for THE painted parade,
Whirl down the wynd like Dervish berserkers,
If life hands us lemons, we'll make lemonade!"
Can't beat that. Other bands that would find their way onto lists designed to cheer me up:
Children of Bodom, Impaled Nazarene, Korpiklaani, Contrastic, Laibach, Rammstein, VNV Nation, Finntroll, Twisted Sister, Manowar, Wuthering Heights, Waylander, Oomph!, Meat Loaf, HammerFall, Nazgul, Blue Oyster Cult, Cryptic Wintermoon, El Running Wild, Eläkeläiset, certain Current 93, Inkubus Sukkubus, Judas Priest, Hanzel und Gretyl, The Sisters of Mercy, Alice Cooper, Immortal, Viking Skull etc.
Anything upbeat, defiant, hedonistic etc. 'brotherhood of metal' stuff always gets me going, as does any metal with humppa or tin whistles.
In fact, to be honest, good music just cheers me up. Unless it's crushingly depressing, like My Dying Bride's 'Turn Loose the Swans' or something.