My music is stored on my real-debrid account, and I use Lidarr and Debrid Media Manager to manage it. For a player/streaming server I'm currently using Jellyfin, but I've used Navidrome and Plex in the past and found them to work great.
All my local music is stored on a NAS which Jellyfin also has access to.
edit: For the lazy there's always SpotifyX for Desktop, and XManager for Android.