my all time favorite song for a while now is Dixie Chicks - Not Ready to Make Nice Its a country song, so sue me.
but I have so many other favorite songs right now: Uncle Kracker - Smile Billy Talent - (all of their songs really) Jason Derulo - Whatcha Say (totally reminds me of the OC. i loved the original song.) Jason Derulo - In my Head (not really, its just a fun song to sing in the car.) Switchfoot - Mess of Me and some songs from the new FMA season OST. =3
One favorite song doesnt exist for me, i just cant be bothered to type them all out.