Somehow, the drums part in lilypond does not cover a notation with only right left. That is right is above the line and left is below it. In the same manner as the bagpipe.ly file, flams and drags are defined as a shortcut.
There has been a lilypond include file earlier made by Simon Froger (which includes all of the above). So first version is a shameless copy.
This is meant to extend or translate some parts.
The original file can still be found at http://lsr.di.unimi.it/LSR/Snippet?id=970
