The origins of piobaireachd extend back to at least the late 1500s. The MacCrimmons of Skye are credited with creating the basic ideas and structure of the form. One of the more influential of the MacCrimmons was Donald Mor MacCrimmon.
In this class Donald covers the Earl of Ross's March found in book 10 of the Piobaireachd Society books page 299. After a discussion of the history of the tune Donald dives in and plays through the tune.