Not impossible though...it *was* a fairly successful AC single, so could have just been in some kind of adult-contemporary music-service rotation. (Maybe tweaked by some Carpenters fan!)
I'm playing XM7 at work today and have already heard "We've Onlyl Just Begun," "Top of the World" and "Superstar." And it's still early afternoon...I heard 'Top Of The World' at the Pet Store, 'If I Had You' at the grocery store and 'Superstar' on my truck radio on the way home.