I really don't have a favorite song, because it's hard to just pick one. My favorite bands are Fall Out Boy, Matchbox Twenty, The Spill Canvas, Bayside, Donots, Lucky Boys Confusion, and Flogging Molly. My favorite bands change alot, but those are my favorites currently.
It is really hard to pick a music, so I will write the name of my favourite bands. Avenged Sevenfold, Megadeth, Rolling Stones, Kiss, Flow, Asian Kung-fu Generation,...
It's really hard to pick up just one song because that changes over time. Right now, one of my favourite songs is Rolling in the deep by Adele. This song makes me goosebumps; I love it!
I'm gonna have to go with the popular opinion here. Picking just one song as your favorite is just about downright impossible. A really good one is Unwell, by Matchbox 20.