What do Ludwig Van Beethoven, Benny Goodman, and Jimi Hendrix have in common?

The short answer, of course, is they all created great music.  The three figures below are spectrograms of passages
their music that will be compared and contrasted in the class.   These spectrograms are graphs of the time changes in tones
in the music (the fundamental pitch tones as well as the overtones).   Click on each image to watch a YouTube video.

Beethoven (from Piano Sonato in E)

Goodman (from Sing, Sing, Sing

Hendrix (from All Along the Watchtower)