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