Quoted: Woody Allen quipped that every time he heard Wagner, he was overcome with the urge to invade Poland. The positions of most others are less clear in their work, although we can hear the difference between the assertive nationalism of Wagner and the gentle folk nationalism of Dvořák or Grieg. In the case of opera, of course, there are more clues. Mozart's, for example, dealt with class war (The Marriage of Figaro) and the liberal values of the Enlightenment. Biographies often provide helpful political information as well. Some composers, like Bartók, were known to have championed the underdog and sometimes clashed with the authorities as a result. Others, like Stravinsky, Mascagni and Puccini, enthusiastically embraced fascism. Still others, like Smetana and Tchaikovsky, were tolerant individualists who kept their distance from mass movements.