Standard audio files are "mixed", you have the stereo file of the final mix and there is no way to get the individual tracks of that mix when this file was created. Sometimes, artist release individual tracks or group of tracks (called "Stems") so their fans can try their own version.
There was an initiative a while ago to make that a standard, called "DJ Stems". I haven't heard much about it lately, so I don't know if it still exists.
Here is a link to an article about that you might want to check out
http://djtechtools.com/2015/03/30/stems-a-new-multi-channel-audio-format-for-dji ng/?nabe=4703208082767872:0
Hope that helps
EdgarRothermich - LogicProGEM.com
(Author of the "Graphically Enhanced Manuals")
http://DingDingMusic.com/Manuals/
'I may receive some form of compensation, financial or otherwise, from my recommendation or link.'