The "idée fixe" has now become a "vulgar dance tune", it is played on the E-flat clarinet. There are lots of effects, including ghostly "col legno" playing in the strings, the bubbling of the witches' cauldron played by the wind instruments. As the dance reaches a climax we hear the Dies Irae (Day of Judgement) melody together with the "Ronde du Sabbat" (Sabbath Round) which is a wild fugue.