According to Nahright, Lupe was the original rapper on Nothin’ on You, but Atlantic chose B.o.B. for the track.  Though I love Lupe, after taking a listen to his version I can understand why they went with B.o.B.   Bob’s sing-songy flow on the song seems like a much better accompaniment to Bruno Mars’ infectious melody.  I can’t see the Lupe track being more than an album cut–not a platinum-selling single.  Don’t take my word for it though.  Click here to listen for yourself.