I'm playing LOTRO on Linux Mint via Steam. Where is the directory I would use to store the music abc files?
*/Documents/The Lord of the Rings Online/Music
You might have to create the Music folder yourself.
To help you find it and be sure you have the right folder, the contents of the The Lord of the Rings Online folder generally looks like this:
lotro.keymap (file)
Music (folder)
PluginData (folder)
Plugins (folder)
ui (folder)
UserPreferences.ini (file)