The tune is an old gaelic air that was given the name "Bunessan".  We know the song as "Morning has Broken" which was a big hit for the Seventies pop star Cat Stevens. According to a 2001 article in the Daily Telegraphy he owes the success of his hit single to a little-known whiskey smuggler, one Mary Macdonald from the Isle of Mull

Cat Stevens topped the singles charts in both Britain and the United States when he released his version of the popular hymn in 1972. For more than 30 years it was believed that the song had been written children's writer Eleanor Farjeon but experts later revealed that the hymn was originally written in Gaelic by a crofter's wife from the Isle of Mull. Mary Macdonald, a member of the Baptist Church, lived her whole life on the island, where she operated an illegal whiskey still.

Mrs Macdonald, who died in 1872 aged 83, wrote the original tune to Morning Has Broken as a Gaelic hymn and this was later translated by Lochlan MacBean, a writer and editor of the Fifeshire Advertiser, to become the popular Christmas Carol "Child in a Manger."

According to the late local historian Attie McKechnie "A lot of people on Mull were quite angry when Cat Stevens released Morning Has Broken with Mary's tune. He was getting all the credit and publicity for this lovely tune while Mary went unrecognised."

 "She had a hard life and was quite a character. Mary made illicit whisky in her own still at the croft. She was quite a businesswoman and moved into smuggling. She used one of the fishing boats to sail to Rathlan Island off Northern Ireland to sell it."