The comment discussion set off is interesting and contains a comment about not mentioning country music and its propensity to sing about drunkenness, beer, and bourbon. Country and western music is at most a sub-genre of pop music. I call it "pop music with a twang". Doesn't mean I reject it out of hand but someone who tries to distinguish country and western from top forty music does not convince me.
Same too with many other musics that people often characterize as being in their own genres. Such as heavy metal, acid rock, hip-hop, dance, etc its all pop music to me.