Yep I store my music collection on my phone as MP3s on my iPhone 6s -- only 32GB. My collection is only MP3s to begin with anyways, and I keep a copy on multipl

Yep I store my music collection on my phone as MP3s on my iPhone 6s -- only 32GB. My collection is only MP3s to begin with anyways, and I keep a copy on multiple desktops and backblaze, using backblaze as origin/source to distribute to the rest. I only ever listen in the car. I create playlists that I can vocalise so that Siri can pick them up and play them so I can listen to stuff hands free. It's a pretty good system. The only real issue is the iPhone can sync to only one mac/library, and you can't do the reverse which is sync your library from your phone back to a mac or Windows or Linux. I can't imagine a good solution for this without redesigning the interface to upload your music is like copying to another filesystem -- but Apple doesn't want you thinking about filesystems anymore.