Can you believe it? No Bach? No Mozart? Once you're finished dying of shock, keep reading.
After reading "Why You Need To Know The Scots-Irish," to which the Blowhards recently linked, I ran a search on a local folk singer and friend of ours, Flora MacDonald Gammon. She is of Scottish descent and is very active in preserving Scottish heritage through song, storytelling, participation in regional festivals, and who knows what else.
My search led me to Voices of the Highlands, with mp3s of Flora singing, a capella, a couple of hymns: Child in a Manger and Psalm 121. The site include mp3s of other local folk singers, as well. But Flora is the best--very meditative. She also gives helpful background information on the songs she sings.