My number 5 is....
Gaga does it again. I love every song on here (though my favorites are the Telephone, Alejandro, and Monster). Even though she is really....uh...weird, everyone has been calling her the next Madonna, and I can see why. Her music is amazing and I hope she continues to make great music.
If you havn't heard this album, listen to "Telephone" and hopefully that will interest you. It's a brilliant song and I'm excited it's going to be a single.