Originally Posted by CharlesRES
The song contained vocals and midi tracks that could be downloaded by the participants. Now I wonder if it is legal to make money on the remix by publishing it on cd's, spotify etc.
Is the material copyrighted?
Yes, this material is copyrighted, unless otherwise specified.
Any part of the remix that you made yourself, that is unique to you and does not come from the remix source material, could be conceivably used elsewhere. So if you replaced the original song's drum track with your own funky beat, you could take your own funky beat and use it in your own original song. But none of the sound files or sequencer patterns that you downloaded from the original song's owners could be used by you without permission.