The Glengarry Collection contains 164 Slow Airs, Marches, Strathspeys, Reels, Jigs and Hornpipes with stories, history and photographs. It focuses on the core of Aonghas' music: Highland fiddling, with its links to pipe tunes and Gaelic songs.
Some of these tunes have never been published before, while others are available only in out-of-print books or in pipe settings, and the collection also includes a number of tunes composed by Aonghas himself, and tunes composed in honor of Aonghas.
The tunes are fully chorded in a style appropriate to Aonghas' band experience. All these are richly illustrated by transcriptions of Aonghas' bowings, grace-notes, stories, and photos of scenes and people from Aonghas' varied life careers, including old family photos. Finally, there is an accompanying DVD with videos of Aonghas' impromptu and passionate performances of 61 of the tunes in the collection.