Sonic Syndicate would be my favorite band and I would have to say my favorite song would be Zion Must Fall or Jailbreak. This is just to answer OP but I really can't just pick one band/artist. So many good ones ):

I like Linkin Park a lot. Like a LOT lot. I still listen to the songs in the album Hybrid Theory.

My favourite song is David Guetta - She Wolf

Nickelback and Bon Jovi are my favourites. Their best songs in my opinion are How you Remind Me and It's my Life, respectively.

I'd say Hollywood Undead for favorite artistS :)
and I'd say Outside by Hollywood Undead for favorite song

My favourite band would have to be U2, their song "Sunday Bloody Sunday" is simply epic :D

My favorite artist is the whiner(chorão) charlie brow jr but he died last month and it best song is glory days and other which has now launched i don't remember the name

My favorite artist overall is probably Robyn.
My favorite song right now is Girls Aloud - Biology.

mine would be A Day To Remember.. my favorite song from them would be either down fall of us all or over my head (rm)

My favorite band is definitely Blue October, those guys know how to build you back up when you're feeling down. They've helped me through a lot of tough times in my life.

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By far, my favorite is How you Remind Me by Nickelback.

Well, I can't choose a favorite band, I'd have to say Hot Chelle Rae AND All Time Low. But I also love Bring Me the Horizon, Pierce The Veil, Of Mice & Men, and Sleeping with Sirens. That's more of my music scene. I don't think I have a favorite song though, it's like asking to choose a favorite child but if I must, I'd say "Therapy"~All Time Low because it's gotten me through so much.