Musicroamer might be a bit more popular than Livestreamer. We know about 2 links to it since March 2021 and only 2 links to Livestreamer. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Perhaps you could make use of something like Livestreamer, and pipe stdout to ffmpeg? Source: almost 2 years ago
Lookup how livestreamer (https://github.com/chrippa/livestreamer) streams from youtube and put it together with ur discord lib. Source: over 2 years ago
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: about 2 years ago
Streamlink - Streamlink is a fork of the discontinued livestreamer project.
Gnoosic - Even if you don't know what you are looking for - gnod will find it.
Unstream by Travis Liew - Third-party Twitch app.
TasteDive - TasteDive recommends similar music (musicians, bands), movies, TV shows, books, authors and games, based on what you like.
StreamBuffRe - StreamBuffRe buffers online streams and redirects them to different destinations.
BandNext - Discover bands that sound similar to artists you already love with BandNext. A single click saves your results to a Youtube playlist.