theres sooooo many...
what is a good song to me might be terrible to you.
I would be hard pressed to pick just a few of my favourites, so instead of favourites, I'll pick ones that really made me think. life changing in a kinda way.
Some of them wont be to your taste at all, but I'll list them anyway: (song, then artist)
Rooftops (A Liberation Broadcast) - Lostprophets
Rip Off the Wings of A Butterfly - HIM
White Horse - Taylor Swift
Woodchuck's Revenge - Go:Audio
21 Guns - Green Day
Lights Out - Mindless Self Indulgence
Snuff - Slipknot
This Time - The Feeling
Disloyal Order of Water Buffaloes - Fall Out Boy
oh, and Shake It - Metro Station is an awesome song, too, but it's not really that life changing xD
I think thats enough now. but if you want more then let me know xD