Online tutorials, examples, lessons, etc.
Dorrotor Bridge – A Bagpipe Lesson taught by Pipe Major Bill Robertson
Dorrotor Bridge PDF manuscript
History of Dorrotor Bridge and the tune. Reference to Willie Ross, etc. https://www.pipesdrums.com/article/Dorrator-Bridge/
Thanks to PM Bill Robertson for sharing a tune of the month and making many tutorials available. See his site at http://www.bagpipe-tutorials.com/