Grooveshark had a better interface for managing "currently playing" than anything I've used before or since. Most apps don't even track what's currently playing in an intelligent fashion. Similarly, rockbox was really great mp3 player firmware, when I used to use one of those. It had a funny feature I've never seen elsewhere: multi-lingual article-ignoring sort. I had German band "Die Prinzen" on that mp3 player, and…
Rockbox's latest release was in May 2017 with a ton of changes and features added and the last change in their git repo was from today (Oct 15) with additional commits over the past few weeks, so not totally dead. However since music players as a whole are practically out, I don't know how much good that'll do you.
If you don't mind me asking, I'd be curious about your setup, I'm considering installing it on an old Sandisk e200 I have around.