String Ensemble,String Trio Cello,Violin - Level 4 - Digital Download SKU: A0.1084013 By David D.Mason. By Henry Bishop. Arranged by David D. Mason. Celtic,Irish,Multicultural,Traditional,World. Score and parts. 12 pages. David D Mason #687841. Published by David D Mason (A0.1084013). Dark Lochnagar is a mountain in the Highlands of Scotland. Sir Henry Bishop set the music to a poem written by Lord Byron. Oh! for the crags that are wild and Majestic! The steep frowning glories of Dark Lochnagar.