Say it Ain't So by Weezer

I really like this song because it's very relaxed at the beginning, it's the "everything is gonna be alright" type of beginning that reminds me to just live.

Yeah Yeah Yeahs by Gold Lion

This song has the beat that makes want to go out there and scream "Hey world, I'm ready for you! Give me your best shot".

The Only Exception by Paramore

This one is rather new and I could easily replace this pick with something more hard-hitting, more impressive, but I've listened to this song everyday since it came out and I like it a lot.