Stereo 8 cassette
The Stereo 8 cassette emerged in the late 1960's. The first prototypes of this audio media, originally called an "8-track", were made by the American, Bill Lear, and quickly became a success. They were easy to handle and transport - you could take them with you in the car, to the beach, or to a party with friends. You didn't need any equipment with special functions such as settings for rotation speed, track selection, etc.