[chrisseaton]

I don't understand - I thought you could stream any audio from their collection that you wanted on Spotify? Do you have to add audio to your library first? Otherwise why does it matter what is in your library and what isn't if you can stream anything?

[squeaky-clean]

It allows you to quickly look through music you like, rather than having to manually search for the artist/album/song every single time.

It's still streamed (unless you save it for Offline, which it supports) but it's waaay better for organization. Have you ever forgetten the name of an artist or forgot an artist exists until you scroll past them in your music library?

[KozmoNau7]

Use playlists, they each have their own limit of 10K songs AFAIK.