In putting together their new album Nothing But Green Willow: The Songs Of Mary Sands and Jane Gentry, Grammy-nominated and IBMA Award-winning songwriter and guitarist Thomm Jutz and his latest trans-Atlantic collaborator, the 32-time BBC Radio 2 Folk Award-nominated Martin Simpson, knew for a fact that they weren’t the only musicians who’d long obsessed over Cecil Sharp’s “English Folk Songs from the Southern Appalachians” collection.