Some people call their original songs "Original Mix(es)" but I don't understand the logic of that because if it's an original song, than why call it a mix? Doesn't mix imply the song is a remix of something else?
It's often used by artists who are assuming that the song will be remixed, but it may feel odd until a remix is made.
Another possible answer is that a "mix" is merely the track itself, with the mix being all the levels, and notes of a song.
