Actually, I think they actualyl HAVE done this with "Smile at You". I mean, Lindsey sings the chorus himself, with Stevie taking the "ahhhs" in the background.
It would have been nice for them to sing more on each other's songs, but like you said, the only time that they've done that was on "I Don't Want to Know", so I guess we shouldn't be too surprised that they didn't do it this time.
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