refactor: new system basics

mpd/playlists/anger starts to creep in.m3u

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+Amon Amarth/2016 - Jomsviking/01. First Kill.mp3
+Amon Amarth/2008 - Twilight Of The Thunder God/08. The Hero.mp3
+Bullet For My Valentine/2008 - Scream Aim Fire/04 - Waking The Demon.mp3
+DevilDriver/DevilDriver - Devildriver - 2003/04 - I Dreamed I Died.mp3
+DevilDriver/DevilDriver - Devildriver - 2003/06 - The Mountain.mp3
+DevilDriver/DevilDriver - Devildriver - 2003/02 - I Could Care Less.mp3
+Dimmu Borgir/Dimmu Borgir - Puntanical Euphoric Misanthropia - 2001/06 - Puritania.mp3
+Exodus/2004 - Tempo Of The Damned/CD 1/03 - Blacklist.mp3
+5FDP/American capitalist/CD 1/11 - 100 Ways To Hate.mp3
+5FDP/Got Your Six (2015)/02. Jekyll And Hyde.mp3
+5FDP/The Way Of The Fist (2007)/1. Ashes.mp3
+Heaven Shall Burn/Heaven Shall Burn - Wanderer/18. StraЯenkampf.mp3
+Kittie/1999-Kittie - Spit/01 Spit.mp3
+Machine Head/2011 - Unto The Locust/03 - Locust.mp3
+Megadeth/Countdown extintion/Sweating Bullets.mp3
+Megadeth/1994 - Youthanasia/03 - Addicted To Chaos.mp3
+Metallica/Metallica - 1986 - Master Of Puppets/02 - Master Of Puppets.mp3
+Rev Theory/Randy Orton Voices Entrance Theme feat Rev Theory.mp3
+Slayer/1998 - Slayer - Diabolus In Musica/01 - Bitter Peace.mp3
+Slayer/1986 - Reign In Blood (2002 Expanded Edition)/01 - Angel Of Death.mp3
+Slayer/1988 - South Of Heaven/01 - South Of Heaven.mp3
+Slipknot/5 The Gray Chapter (Versión Deluxe)/CD1/11 - Slipknot - 2014 - Custer.mp3
+Slipknot/5 The Gray Chapter (Versión Deluxe)/CD1/13 - Slipknot - 2014 - The Negative One.mp3