It's not "ultimate" by any stretch, but it's a really good command-line mp3 player, and the one I use the most. It's been a long time since I've researched it, so there may be better ones out now.
I just don't like the cover art manager, everything else is jut right for me.
The sync app is separate, free app just used for serving files to the mobile app for syncing though.
I also find that I never got into playlists, so something that can easily be coaxed to just swallow 100Gb of content and let me occasionally search for a specific track is my speed.
The amount of visual flare that thing managed to produce in the heydays of WinXP was stunning, felt like operating a scifi-movie prop with all of the alphablended animations shooting out of the player window at times.
getmusicbee.com