LOL this are the type of threads I like! Music has always been entertainment, nothing more, nothing less. Yes, you are going to tell me that they deal with emotions, personal stories and a long list of romantic etc's, well, movies too, books too, even some products like cars, bikes, houses, the list is infinite!
The main difference I think is that 100, 80, 60, 40, even 20 years back you had the "silly" songs that everybody sang and danced and then you had artists like Jethro Tull, Procol Harum, Frank Sinatra or even Queen, they indeed navigated on deeper waters either with the lyrics or with the sounds, or both. And they used to have their big number of followers. Nowadays we don't have artists like that, at least not on the mainstream circuit, massive rock bands? It's been at least 10 to 15 years since they scored a true hit. I think THAT is the difference.