Wayne Hu at the University of Chicago provides this online tutorial to educate students about the basic principles and concepts related to the cosmic microwave background. Through a series of colorful slides, users are introduced to concepts such as cosmic expansion, gravitational instability, seeing sounds, and music of inflation. Visitors can find pdf files for old and updated talks about the subject. At the end of the tutorial, the author provides a series of links to additional tutorials where users can find more in-depth information about concepts connected to cosmic microwave background.