The first personal music player
A German-Brazilian, Andreas Pavel, made the Stereobelf in 1972. lt had headphones and used casselfes, Pavel wanted people to have music everywhere they went. He met directors,of electronics companies and they listened to the Stereobelt but said, "People listen to music in public." So Pavel never sold his idea, but his personal music player was the first Sony's Walkman was the second, and people loved it.