‘Furt’ episode also features ‘Marry You,’ the fourth Mars song to be covered this season. By Amy Semigran Bruno Mars Photo: MTV News It’s no surprise that one of 2010’s biggest collaborators, Bruno Mars , has already teamed up with the folks at “Glee” three times this season. While last week’s cover of “Forget You” (which skyrocketed to #1 on the iTunes charts after Gwyneth Paltrow’s take on the tune) technically belongs to Cee Lo, Mars did partially write the wildly popular tongue-in-cheek track. And new kid Sam sang “Billionaire,” Mars’ collaboration with Travie McCoy, in the season premiere. Now it’s his solo work that’s getting the “Glee” treatment. In this week’s episode, “Furt,” Finn (Cory Monteith) sang “Just the Way You Are,”
