Songs in the Key of E: Electronic Music

"For most of recorded history, musical instruments were mechanical—horns, woodwinds, and even stringed instruments all relied on vibrating air to produce sound. At the onset of the 20th century this began to change. Electricity, which was already revolutionizing virtually all other aspects of life, began to reshape musical instruments, broadening and expanding the world of music itself. ..."
A nice little history lesson. Songs in the Key of E (at The IEEE Virtual Museum)