The dance, however, is not a waltz, but an obertass--the most popular of the rustic dances of Poland. Why should Boito have made his Rhinelanders dance a step which is characteristically that of the Poles? Sticklers for historical verity could easily convict him of a most unpardonable anachronism, if they were so disposed, by pointing out that even if German peasants were in the habit of dancing the obertass now (which they are not), they could not have done it in the sixteenth century, which is the period of the drama, for the sufficient reason that the Polish dance was not introduced in North Germany till near the middle of the eighteenth century. But we need not inquire too curiously into details like this when it comes to so arbitrary an art-form as the opera. Yet Boito was his own poet, master of the situation so far as all parts of his work were concerned, and might have consulted historical accuracy in a department in which Gluck once found that he was the slave of his ballet master. Gluck refused to introduce a chaconne into "Iphigénie en Aulide." "A chaconne?" cried the composer. "When did the Greeks ever dance a chaconne?" "Didn't they?" replied Vestris; "then so much the worse for the Greeks!" A quarrel ensued, and Gluck, becoming incensed, withdrew his opera and would have left Paris had not Marie Antoinette come to the rescue. But Vestris got his chaconne. In all likelihood Boito put the obertass into "Mefistofele" because he knew that musically and as a spectacle the Polish dance would be particularly effective in the joyous hurly-burly of the scene. A secondary meaning of the Polish word is said to be "confusion," and Boito doubtless had this in mind when he made his peasants sing with an orderly disorder which is delightful:-- Tutti vanno alla rinfusa Sulla musica confusa, or, as one English translation has it:-- All is going to dire confusion With the music in collusion. [Musical excerpt--"Juhé, Juhé! Tutti vanno alla rinfusa"] Perhaps, too, Boito had inherited a love for the vigorous dance from his Polish mother.