for the first time..ever really, I've started to like pop music.
mostly gaga.
well, exclusively gaga.
Once you like gaga, it's only a small step to Ke$ha.
Ke$ha is basically a bunch of bad rip offs of pop ideas thrown together, and it sounds like that. You listen to it and go oh this sounds like a big pop song because of all the rip offs, not that it is actually good.
So I am pro-Gaga and not a Ke$ha fan at all

Gaga on the piano doing poker face got me, plus she does has lots of influences from the past 20-30 years of pop music but they are influences and blended with an overall style, unlike the cut and paste style of Ke$ha.