I try to keep an eye on the iTunes store top songs list and I've noticed that a duet by Kevin Rudolf and Lil Wayne called "Let it Rock" has been hovering around the top 12. For those of you who aren't familiar, Rudolf is a producer/guitar player-turned-singer (for this single) who's credited on an array of pop songs, like Nelly Furtado's "Say It Right."
"Let It Rock" is super catchy and (almost) makes me feel like I should go for a run.