Ok, to get something clear: SONGS MUST BE IN MP3 FORMAT!
.??? to .mp3 conversion:
Step 1: Export the song from your program as a .aif or a .wav or whatever audio format your computer uses. DO NOT EXPORT AS MIDI >:(
Step 2: Right click on the song file and select itunes to open instead of quicktime or windows media.
Step 3: Select your song in iTunes.
Step 4: Go to advanced options and select "Make mp3 Version."
Step 5: Upload the mp3 version to Zshare.
Step 6: Post the song link, not the download link, in this thread.