Selfhosted

MPD (Music Player Daemon) would be perfect for that old Autonomic - super lightweight, runs on practically anythng, and Symfonium is an amazing Android client that supports it natively.

I use navidrome for the streaming and lidarr for downloads. I am not totally thrilled with navidrome as I can not play genres. I want to setup an icecast streaming server with individual "channels" for each genre

Honestly just in ~/Music and stuff I'd like to listen to on the go gets copied onto my phone.

Plex and Plexamp. I know the dislike for Plex here, but it works for me and Plexamp is a fantastic piece of kit which, in opinion is worth the lifetime sub alone.

Have always preferred Emby. Have been running it for around 8 years.

Mpd + a frontend of your choosing, I prefer ncmpcpp, will run on just about anything and is remotely controlled through apps or ssh. Mpd is great when the server is physically connected to the audio output device. I use it to remotely control a speaker connected server that can also run Plex (because I prefer plexamp for streaming and syncing to my phone, other android devices, and smart speakers). They both look at the same directory of a collection near 30 years in the making with hundreds of thousands of files and a wide array of formats.

VM having a EXT4 disk on a ZFS storage.
Files are (usually) FLAC
Files are ripped from CD with Exact Audio Copy (EAC)
Alternatively they are bought or 'lent' out ;)
Files are managed by Lidarr.
Jellyfin for streaming.
On mobile I use Symfonium (alternative: FinAmp or Gelli).

E:\mp3

Navidrome for me. Installed via Yunohost.

I was going to try to host my music on Jellyfin, but I had an issue.

Since 2005 I’ve been curating my music collection with my old iPod that I still use.

I like my albums in release order so, with the iPod in mind, probably 80% of them are named [year] - [album]

Lidarr and Jellyfin won’t find them because of this and I don’t want to manually sort through 2000-some albums.

So I still use my iPod (20 years old next year!)

I use Jellyfin with FinAmp for Android. Even supports offline caching.

Plex and PlexAmp

Navidrome server, symfonium on android is amazing. I also use maloja and multi-scrobbler to caoture plays from multiple sources and keep a in-house record of my plays.

I currently host Navidrome, which has an okay web player. On Android I use "Tempo" (though it is unmaintained) to connect to it, and on Linux I use Tauon (though it has very poor playback). I could not find a native Linux client that is not buggy unfortunately, so I'm also on the lookout for better solutions! I'm not familiar with the device you are talking about but every client I tried supports MPRIS, which are the regular media controls that can be used via the playerctl command, so you should be able to hook things up that way.

Hosted with Jellyfin, for clients I use Symfonium on Android and Feishin on desktop.

Navidrome, Feishin, Tempo.

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Plex Server + Plexamp.

I use Jellyfin with Finamp on Android/PC and the Jellyfin plugin for Kodi on my HTPC.

The Jellyfin plugin does movies/shows too and not just music but it handles music playback as well. For a dedicated music box I'm not sure if I would use Kodi for it.

Navidrome + MusicAssistant

Plex + Synfonium

Also

Navidrome + Synfonium / Tempo

I'm trying out different things in prep to switch to navidrome. I'm impressed how lightweight it is and it hasnt required much work to fix up the library tags as most were already minimally tagged.

One I figure out a secure way to expose it behind auth I'll be able to switch over.

Its been a heck of a time trying to get forwardAuth working with Zitadel so I'm trying out Authelia

Why do I see no mentions of Ampache here? From what I found, it was the only program except Navidrome to support nested smart playlist, and Ampache has the editor directly in the web interface.

Anyways, I host mine too! Over 2TB of music files on my server, and it runs pretty well.