Change music

In Classic UO client,
how do i change the login music to always use "oldult06"?
also in game, how do i manage to play this music more often?

I'm not positive, but you may be able to just go into uo files, find music folder, copy that song and rename the copy to the ones you want to replace

thanks Daggoth
i understand i can change the file names
but does anyone know how to find/change the "mapping" of music files?
eg. where in the configuration shows that the system plays the "Moonglow" file when i enter Moonglow?

I assumed it used the file name for each tune in that music folder.