If I hear a song I like in a movie, game or other media I add the song and the discography for the artist to the downloader.
Once I have some free time I listen through those songs and filter out everything I don’t like.
The rest gets added to my collection. I never delete songs unless something slipped through like a short interlude.
Same here, all my 4k players run Kodi/CoreELEC with the Jellyfin plugin.