I have been around since April 21 1999, there never was a command called /song it was /cast:
http://everquest.allakhazam.com/hist...es-2005-1.html
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January 26, 2005
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- /stopsong, /cast, and anything starting a song other than /melody now
clears the /melody buffer as intended.
And as I posted earlier the /melody command was added to Everquest in December 2004. I can't count 3rd party programs as I never used one.