Very interesting thread. Does anyone know why Wikipedia lists the McKenna family as the authors?

"Wild Mountain Thyme, also known as Will You Go Lassie, Go, is a folk song, originally written by the McKenna family in the early part of the 20th century but was made famous in 1957 by William McPeake and his son Francis McPeake, natives of Ulster, Ireland.[1] It is often mistakenly believed to be a traditional song, but the copyright is held by E.F.D.S.S. Publications, who published it for McPeake.[2] It was first recorded by Francis McPeake in 1957, and has since been covered by numerous artists."

http://en.wikipedia.org/wiki/Wild_Mountain_Thyme