That wasn't in my suggestions. 
If you turn off the entire plugin, you'll lose a lot of functionality.
If you just don't want music to play at all in the viewer pane, disable the specific formats/extensions within that plugin's configuration dialog, as well as the movie plugin.
If you want it to play but only when you click, try my suggestion above.
(Note that disabling the Movie plugin also reduces the amount of metadata available in the file display, although you can get similar data via the shell using this: Video length, dimensions, framerate, definition columns )