Musicroamer might be a bit more popular than Playlist Machinery. We know about 2 links to it since March 2021 and only 2 links to Playlist Machinery. 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.
I love all the tools from PlaylistMachinery when I'm looking to do things Spotify won't... Like dedupe. http://playlistmachinery.com/. Source: about 1 year ago
There's no way to do it inside the official Spotify app. There are some 3rd party tools that offer some interesting functionality though like http://playlistmachinery.com/. 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
Magic Playlist - Get the playlist of your dreams based on a song
Gnoosic - Even if you don't know what you are looking for - gnod will find it.
Slackbox - Spotify playlist collaboration through Slack
TasteDive - TasteDive recommends similar music (musicians, bands), movies, TV shows, books, authors and games, based on what you like.
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
BandNext - Discover bands that sound similar to artists you already love with BandNext. A single click saves your results to a Youtube playlist.