Maddy prior, Sandy Denny, June Tabor, Ella Fitzgerald, Bessie Smith, Maria Callas, Diana Krall, James Taylor, Stan Rogers, Bruce Cockburn, Tony Benett, Joni Mitchell, Vera Lynn, Edith Piaf, Karen Carpenter, Anne Murray and Laura Smith. I also was surprised to Whitney Houston on the list..she looses the tune and confuse volume with intensity.