Favorite song? Oh man. That's like rocket science for me! /)n(\ I can tell you my 3 most favorite bands though.
Paramore, my favorite band of all time, is a pop rock band from 2005. Good songs are That's What you Get, Hallelujah, Misguided Ghosts, The Only Exception, Still Into You, and much much more! They are still making music! I also really like Blink 182, a pop-ish punk rock band, and Panic! At The Disco (so much the lead singer is in my icon! He's younger in that picture, possibly from 2008, btw. Brendon has shorter hair now.), a band of mixed genres, but is on the pop side. I knew Paramore and Panic! At The Disco since 2007, and Blink 182 since last year. Blink 182 is not making music anymore, but P!ATD is. Both Paramore and P!ATD are signed to the same record, I think, Fueled By Ramen.
I can say more, but most of them are indie bands, bands that died out, bands that you probably will not like, and/or bands/singers that you are probably sick off. :B