The big shift in the last 20 years wast in hardware but in delivery. Streaming has changed the music industry, not all for the better. Better for the content users and the streaming companies. Not so much for everyone else in the business. Now for the price of one CD I can listen to almost anything I want as much as I want for over a month with out getting out of my chair, this would have been a dream when you had to go downtown to flip thru records and not find what you were looking for
The down side, less money going into artist development, so you can listen to anything but there is not as much good music to listen to. Instead of a label spending money (they no longer have) on gigs so an artist can learn to sing/play they just use autotune etc. Sorry for the off topic rant.