I’m currently using Vanilla Music which is ok in some ways and annoying in others. There was another one I tried that I didn’t like but idr which one it was. There are a bunch of others that I haven’t tried. I only have a few music files on my phone, so it doesn’t matter much. On my laptop I just use mplayer from the command line. I haven’t ever felt much need for fancy graphical players. I’m old enough to remember physical CD’s and cassettes. It wasn’t a big deal then and it still isn’t.