Don't have a favorite band, probably never will. I say you just try to find good songs whenever you can. If I had to pick some, maybe for hard rock - toxicity, rock - black night or somwthing by dirty vegas, like-2-months-ago - party rock anthem or zero gravity, classic - beatles, country - why would anyone want to listen to this (my opinion), etc.
ahhh lady gaga, it reminds me of her song pokerface which is how to wake her up LOLZ. my favorite song would be Say (half past nine) Hot Chelle Rae or For the First Time by The Script
My favourite song is "Help!" by the Beatles, which also happen to be my favourite band. If I had to choose a second song, I would choose "I Wanna Hold Your Hand" by the Beatles aswell. And if I had to choose a second favourite from a different band, I would choose "Heart Shaped Box" by Nirvana.