From FenixWiki
			
												
			
 Definition
INT unload_song ( <INT SongID> )
Frees the memory occupied by the song file, previously loaded with load_song().
  Parameters 
|  INT SongID  |  - The SongID of the song to unload.
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  Returns 
INT : Error.
|  -1  |  - Error: sound inactive; invalid songID.
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|  0  |  - No error.
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