There’s not much Justin Bieber can do to convince all his tween fans’ parents that he isn’t a total waste of space — except maybe duet with Bryan Adams. Thank the music gods (and their label, Universal) that miracle has happened: The two flew all the way to Berlin — because Canada would’ve been too obvious — to play “Baby†for an industry dog-and-pony show. As history has proven, it’s near-impossible to resist the charms of “Baby†— add Bryan Adams on acoustic guitar, and, well, we’re all a little enamored of this unexpected pairing. If only we knew what it meant.