Which Irish ballad written by Frederic Weatherly was featured on the album The Sweatheart Tree by Johnny Mathis?
The Sweetheart Tree: The Sweetheart Tree is an album by American pop singer Johnny Mathis that was released by Mercury Records on September 30, 1965, and included songs associated with Italy ("Arrivederci Roma"), France ("Clopin Clopant"), Ireland ("Danny Boy"), and Scotland ("The Skye Boat Song") as well as several selections, such as "I'll Close My Eyes" and "The Very Thought of You", from English composers. Danny Boy: "Danny Boy" is a ballad set to an ancient Irish melody. Danny Boy:  The words were written by English songwriter Frederic Weatherly and usually set to the Irish tune of the "Londonderry Air".
Danny Boy