Nearly all the popular music I hear these days (and by "pop music", I refer to Billboard's top singles/songs chart) has pitch-corrected vocals to the extent that it sounds like a robot is singing. There are no live instruments - everything is sampled or programmed. Generally, the music is incredibly simple and unsophisticated and has little to offer beside sonic hooks (particular sounds or noises) and vocal/lyric hooks. I tend to refer to it as "machine music" or "robot music" since there seems to be very little humanity to it.
I'm going to blame the cut-and-paste practices tied to the rise and growth of hip-hop in the 80's and 90's for the general dumbing-down of pop music over the last 30 years; based on their product, most commercially successful producers in these genres don't seem to understand any theory beyond the very basic rudiments, caring far more about "beats". This results in skeletal "songs" that occasionally have no discernible chord progressions and only the vaguest notion of overall harmony, and that came from whatever was sampled to create the "new song".
For examples, check out this week's crop of top songs.
Top 100 Songs | Billboard Hot 100 Chart