I don't have a great deal of music shame, but I'd probably be careful in choosing who I reveal my enjoyment of Bon Jovi / Lady Gaga / Linkin Park / Smile.dk / Madonna / Tom Jones / etc to. Some folks with a lot more unfounded shame set a lot of stock by this sort of thing for some reason.
(For the record: I was into BJ before they actually stopped being rockers, LG is just plain fun pop music of a sort we haven't had for a while in this XFactor-saturated world (even if it does have dirty lyrics and a lot of autotune) who I blindly bashed like everyone else until a friend who's a rabid fan put an hour-long medley on a pub jukebox, LP I saw in concert recently and they tore the goddamn roof off, SDK... well, yeah, guilty pleasure, Madge is a mixed bag but a cleaner LG if you pick wisely, and TJ, well... he's The Voice after all)
Oh - actually ... yes. Justin Timberlake and Usher. I busted many a move to them whilst doing nightclub bar work. Ahem. It's trash, but it's infectious. The otherwise despicable NDubz may end up going the same way.
Heck of a lot of artists of the same clans of those three I simply can't abide however. I don't know how they particularly make the cut and the others don't.