Few notes for those of us who are really bad at getting things to work right:

1. This is only up on the Roheryn server. If you try it on normal servers, it won't work. Heh.

2. If you don't have the music folder in My Documents\The Lord of the Rings Online (it is the folder where it saves your screenshots to), you can just add a folder named "Music" there, and that ought to work. You want to put your .abc files inside that folder. So, the full path of a file might be C: Documents and Settings\Computernamehere\My Documents\The Lord of the Rings Online\Music\test.abc

3. To make a new .abc file (which is what you need to use), open up a .txt file with notepad, copy and paste the stuff that you need in there, and then when you go to save file, set it to "All files" instead of just ".txt", and put a .abc at the end of it (so you would name the file "test.abc" minus the quotation marks).

4. To play that file, when in /music mode, type /play test, or /play test.abc (or whatever you have named the file). Both have worked for me.