Well, I love music, so I know the words to A LOT of songs.
So, this is going to be sort of hard, to pick just one. Which means there will most likely be a few again.
Some of my favorites to sing along to are:
You Found Me - The Fray
There Is - Box Car Racer
Curse of Curves - Cute is What We Aim For
Sugar, We're Going Down - Fall Out Boy
Paper Planes - M.I.A.
Ignition (Remix) - R. Kelly
That's What You Get - Paramore
Baby, Come On - +44
For your listening and viewing pleasure...
Also, you better believe I know all the words to almost all old school Nsync, BSB, and Britney Spears songs. As well as most Dashboard Songs.