What's your tune?

OK, I've been thinking a lot about music lately and what my favorite song was?
Tell me what your favorite song is and why.....

My favorite song..this week is what goes Round comes Around by Justin Timberlake. The reason it is my favorite song is that the song is a very fun song to sing and dance to. I love being able to just hear the beginning and be dancing the whole entire song through and then rewind it to dance and sing to it again. :)