Does anyone know how to change the music?

[hopeyeu]

I have put new music in the \My Documents\My Games\Sid Meier's Civilization IV\CustomAssets\sounds\soundtrack folders (Classical, Industrial etc.) but they don't play in game so do I have to change anything in the ini or somewhere else to get the game to use the custom assets?

Its the Steam complete version of the game.

Thanks in advance.

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