Variations on an original theme,Op.36"Enigma" Variations on an original theme, op. 36 'Enigma' Variations on an Original Theme,Op.36"Enigma" Varations on an Original Theme, op.36"Enigma" Variations on an Original Theme, Enigma; Variations on an Original Theme,Op.15 Variations on an original theme, op. 36 "enigma variations" Variaitions on an Original Theme ('Enigma') Variations on an original theme Variations on an original theme ("enigma"), op.36