Here's a link that goes in to more accurate detail on the revenues generated from music sales in the US from the decline of vinyl to the presently still rising digital single download money stream.
The conventional mainstream music business was always a really bad solution for the majority of artists ('Pop' music became essentially a definition of music that doesn't really matter) and the truth of that is really apparent when, after like 60 years of that evolution of that business model, its near total demise has left the artists with a situation as though the business never existed -60 years of music making culture is now comercially stunted and business is now almost entirely in the hands of the artists themselves. Now, of course total artistic control has always been a goal for the creators, but there is no way to really centralize a business and marketing model that would bring consistent and decent profits. The mainstream comercial business was centered on the sales of whole LP/cassette/CD's but now the market reality is the consumers just buy single downloads. And for the artists to have to fall back on just live gigging is to be condemned to one of the harshest commerical working environments and routines a working person can take on. The overall bad outcome, according to statistics, people on average now listen to and buy far less music than in the past, before the internet. One good thing though, with ultracommercial corporations pushing less music on the public and with the internet there is an amazing expansion in the actual making of the music, and the diversity of kinds of music. Yes, there are still some large, plodding record labels out there but their relevance and viability have been so reduced there is no way for them to escape the fact that it is so apparent now they work with ideas that come from a time when we knew less.