I have a very large music collection. But since Spotify I dont need to carry all of them in my phone that's impossible my phone should have like 1TB and just for music. Before I could only listen the music I uploaded to my phone so if I wanted to listen another artist or explore music I couldn't. I think spotify simplifies everything I can listen whatever I want in anytime and I dont have to worry about storage size in my phone. Also it helps me to discover new music in a very easy way.