I use vlc with youtube videos, playlists and local files for music and videos. works great but probably not the best route for just music as it has to play a video as well, but i just downsize it offscreen and well in the background layer. However, there is no need to 3rd party desktop capture and have it playing in a second app which was what I was running into.
I try to only have obs, my twitch dashboard, and streamlabs events running. Once streamlabsOBS OS comes out, I won't have to do all of that, just 1 program. so here's hoping!
I was thinking of going with twitch's Spotify music player but I have found that not everything in the twitch CC free playlist is youtube CC free, and also I have an easier time of finding Twitch CC Free music on youtube as well. Youtube is the endgame for the best of/fails and so for me, it's easier to plan for that. I never felt up to the siphon inject