I think that streaming is a tangible model if you have varied musical tastes and don't want to invest a fortune in a music collection. Since I've been part of Netflix/Amazon streaming, I haven't bought a single movie to own.
The brilliance of streaming is that you can listen to the same song over and over OR go on a wild journey - compare different conductors of Beethoven's 9th or listen to as many renditions of "Fly Me To The Moon" as your heart desires. You can go on a Bee Gee's binge and then wander over to listen to Glen Campbell. For someone that just loves the variety of music, its like renting the World's greatest music library.
I own almost every album I think I want, and I am addicted to iTunes Match, which gives you access (at AAC 256) to every song in your library (up to 25,000). I'd pay $10.00 per month to have access across all my Apple devices to 24/96 versions of albums I already own via stream.
If your internet connection cannot handle this, you may want to try something other than a phone modem :)
I have Spotify installed, and love the ability to go off on instant, instinctive or off-the wall listening tangents. It is great, yes, but it sounds only so-so. It is part of my listening experience, but only a part.