>>1547586
The short of it is that rock and roll happened, but big band style music, especially lounge, stayed en vogue until the mid to late 1970's. Iirc, Sinatra's last original album was released in mid 1970's or somewhere thereabouts.
>>1547586
music has become more consumer based. also most of the artists who do make this kind if music, write almost exclusively for movies
>>1547586
Too expensive. You've got one guy needing dozens of people to play his works, it means a hell of a lot less people actually manage to get their work heard, and that after a rather long career of being a nobody. Compare with forming up a 4 men band in your garage and rocking on. Artists just went with the better option for themselves.