Seeing as how you commented elsewhere that you're prepping for a DJ set, presumably for a genre you don't know too well, you might want to stick the relevant musicians in Ishkur's Guide to Electronic Music into a portal like Music-Map, Gnoosic, or Music Roamer to see what else comes up. Source: about 2 years ago

I took OP's question as a media discovery tool for Lidarr and not so much the request management side of things, but I could be wrong. I'd be interested in the media discovery side of things. I often play around in MusicRoamer, but it's not at all linked to Lidarr. Source: over 2 years ago

I'm not sure if this would fit all your needs aside from running on Linux but Ampache [1][2] has been around for a very long time and has the ability to mesh with other instances. It started as a small project run by some students at OSU and evolved over time. [1] - https://ampache.org/ [2] - https://github.com/ampache/ampache. - Source: Hacker News / about 1 year ago

Https://ampache.org/ could be an alternative. Source: about 1 year ago

You can also do something such as build a mp3 server on headless Debian install https://ampache.org/. Source: over 1 year ago

Now it's time to make backups of my nextcloud, bitwarden, ampache files. Source: over 1 year ago

Ampache. I've been using it for a while and it's great. I'd suggest using it with Ample, as Ample's UI is better. It supports the Subsonic API, so subsonic clients will work with it. It also supports DAAP and uPnP, for other clients. It has it's own API as well, but not many apps use that. Source: over 1 year ago