As we ease out of summer, it's clear we have a 2012 trend on our hands: the optimistic party song. Now, this does not sound terribly novel--happy party music--but there is an unusually positive attitude in a lot of the singles being released. These singles are making a movement away from the grittiness of last year's dance songs, as well as away from irony, toward sincere, bright choruses about good times. Check out these singles (some of which are charting well and some not). I am a fan of the first selection in particular, a charming duet featuring Whitney Houston and Jordin Sparks. Bask in the joy.