In 1807-08 Thomas Moore published a number of poems set to old Irish airs in a set of volumes titled "Irish Melodies". Among the more popular songs were "Believe Me if All Those Endearing Young Charms" and "The Minstrel Boy". I wonder how old songs like "Cockles and Mussles", "The Holy Ground" and "I Know Where I'm Going" are? They are usually listed as "traditional".