Julie Fowlis is my favourite of the moment. Just about any Scottish Gaelic singer - especially female - will have some puirt-a-beul in their repertoire. Patsy Seddon and Mary McMaster of "Sileas" and the "Poozies" have recorded mouth music. Also Anna Murray, Rhona Lightfoot, Mary Anne Kennedy, Karen Mathieson of "Capercaillie" - just some off the top of my head. There are many, many more.