Mrrzy, Master McGrath was always sung to the same air as Sweet Betsy from Pike, and the Behan version was the one that had "shove that up your nostrils sez Master McGrath". As for the Clancys rendering I have Tommy Makem racing through it faster than the dog, and his air is "Sweet Betsy". Also Ronnie Drew sings it using an air that I had never heard before and I wouldn`t want to hear again. Slan Ard Mhacha.