I sync my music between my phone and various computers.
My phone music app manages playlists by editing M3U files, and I can keep them in a playlist folder or in the main music folder and stores info in the form:

John Mayer/Where the Light Is_ John Mayer Live in Los Angeles Disc 1/12 - Vultures [Trio Set].mp3
Luther Wright & the Wrongs/Rebuild the Wall/1 - In the Flesh?.mp3
Flaming Lips/Yoshimi Battles The Pink Robots/07 - Are You A Hypnotist__.m4a
Jon & Vangelis/The Friends of Mr. Cairo/The Friends of Mr. Cairo-.mp3
Rush/2112/02 A Passage To Bangkok.mp3
Adam Hood/6th Street/04 - Play Something We Know.mp3
Def Leppard/High 'N' Dry/09 Mirror, Mirror (Look Into My Eyes.m4a
Jane's Addiction/Ritual de lo Habitual/07 - Then She Did.m4a

I can't seem to find any desktop linux music players that will also use this playlist form for keeping and editing playlists. They'll play the list, but if you want to add a song its not reflected back into the file. <-- that's the main functionality I'm looking for, a sort of "live" edit, not an export feature.

I know this is possible (because computers), but I can't seem to find any way to make this happen (maybe bad google skills?)

Does anyone know a way to do this?

- Dave