Radio broadcasts leave Earth at the speed of light. Scroll away from Earth and hear how far the biggest hits of the past have travelled. The farther away you get, the longer the waves take to travel there—and the older the music you’ll hear.

Smarthistory at Khan Academy is the leading open educational resource for art history. We make high-quality introductory art history content freely available to anyone, anywhere. Smarthistory is a platform for the discipline where art historians contribute in their areas of expertise and learners come from across the globe. We offer nearly 500 videos and these are being translated into dozens of languages.

Use Dipity to have students build a multimedia, interactive timeline. It could be used for students to develop an historical timeline of some aspect of music or even to document their own musical growth and development over time.