I have found the answers. These industries are paying radio stations, Pandora, Spotify, iTunes, etc. to play songs they have written subliminal messages into. Not just to play them, but to play them a certain amount. There are studies that show people like a song more after hearing it a couple of times. Do you remember the first time you heard Iggy Azalea or any other pop artist on the radio? It was disgusting. But, after becoming familiar with the song, and being forced to listen to it enough times, we, the dumb people, the common man, begin to like it.
They are playing us for money. They have certain beats and themes in the music that drive us to spend, influences our descisions, and causes us to become fat and complacent. We are not safe.