You're Gonna Go Far Kid-The Offspring! It's never been my top top song, but it's been one of my favorites always, and I never get tired of it (like I do my other favorite songs)
I Can't Decide-The Scissor Sisters
Rum 'N Coca Cola-Tim Tim
These are the ones I listen to all the time over and over
Hero by Enrique Iglesias preferably the one where sean berdy signs it.
Over the rainbow/what a wonderful world by Iz (Israel Kamakawiwo'ole)
Walking in the air from the animated movie the snowman
Skyscraper Demi Lovato
Take My Bones Away by Baroness, Valium by the Better Pills, An industry of Murder by Graveyard, A Touch of Evil by Judas Priest, Curl of the Burl by Mastodon, Fat Bottomed Girls by Queen, Bombtrack by Rage Against the Machine, and sooooo many more....
I really can't narrow it down to just one song. I have far too many favorites to ever claim that I love one more than the rest, but the most currently-played songs in my playlist are a tie between "Elaman Kevat", and "Them Walls", both by the Finnish band Poisonblack.