Reply to Copyright Issue

I have made a couple of mixes but SoundCloud doesn't let me upload them because they obtain parts of popular DJs songs but I hear SoundCloud mixes all the time and hear songs of these artists. One of these songs is a KEY to my mix so I can't take it out. What do I do? Is there anywhere else I could post? Or is there a way to cheat soundcloud? cause apparently everyone can play popular EDM music in their mixes except me lol.