Simple.  Only music related options and nothing else, it doesn't matter how hidden the video player is or otherwise, it needs to not be there. Take a look at Spotify, Apple Music, Tidal, PlexAmp, they're optimised for a workflow dedicated to play music, they all have give or take the same look, feel and workflow. This is why my wife will use Plexamp and won't use Emby for playing music.
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