Oh geez, my choices are deeply tacky and cheesy, but I love them dearly, and I don't think they're terrible at all:
Literally anything by Smash Mouth, that shit was my childhood. Every note is like dancing in the grass on my front yard in '99 with my brothers. We had a boombox. And Jimmy Eat World's In the Middle on loop.
I love ABBA. Non-ironically. I was introduced to them by my parents as a child and I fell in love. They are delightful. I think they're awesome and talented.
I cannot get enough of Eye of the Tiger. Everyone I know hates the song with a burning passion, but I can listen to it for days on end. It makes me deliriously happy.
IT'S THE EYEEEE OF THE TIGERRRRR!!!!!!!!!!!!!!
.... I think I need to go listen to some power ballads now, my final assignment being due in 7 hours and all.
EDIT: Oh geez, I can't believe I forgot I Lost My Heart To A Starship Trooper!
http://www.youtube.com/watch?v=1wwilCs4Jqg