Here are some podcasts to help you in your studies of our final period of music history, the 20th Century.
https://s3-us-west-2.amazonaws.com/textimgs/SantaAnaMusic/20thC/2ListeningHelp1.mp3
https://s3-us-west-2.amazonaws.com/textimgs/SantaAnaMusic/20thC/2ListeningHelp2.mp3
https://s3-us-west-2.amazonaws.com/textimgs/SantaAnaMusic/20thC/2ListeningHelp3.mp3