A lot of where the money is in music today is in sync licensing, licensing for film, television and advertising. An album can completely fail in terms of sales, but make substantial money in licensing. Since most broadcast and streaming is now in 5.1 and/or Atmos now, having the music ready in surround means it can appear as you want it to appear and not be mixed poorly at the last minute without producer, artist, etc input. Sync licensing can be hugely lucrative, for example the for the series Mad Men a Beatles song was licensed for $250,000 and apparently 'Thunderstruck' by AC/DC commands half a million per film (and appears in a lot of films at that price). But ordinarily songs license for anywhere from $10K-$60K and more is made if they land on a soundtrack, compared to streaming it's huge.
In some cases, licensing can take an obscure piece of music to something that generates significant sales and streaming (best example being the VW commercial which moved Nick Drake from being an obscure cult artist to a legend in the late 90's) or it can take songs from people like Kate Bush or Linda Ronstadt and introduce them to a new generation (via Stranger Things and The Last Of Us). It's likely also why you're starting to see some surround albums, or boxed sets include instrumental mixes of the whole album. In the past 10-15 years some publishers have been putting out promos (often as CDr's) with released album and an instrumental mix of the whole album (I have a a couple of Decemberists releases like this). This is an effort to generate sync licensing opportunities for incidental instrumental use in film, TV, etc.