 ", "Euphoria", "Merry Christmas for Blanche", and "Birthday Melody for Blanche".The work is the most famous and widely played of Cowell's tone cluster pieces, which he performed during tours of North America and Europe from the early 1920s through the mid-1930s.A performance of Cowell's so inspired Béla Bartók that the great Hungarian composer sought Cowell's permission to use tone clusters in his own work.