Wired Magazine lists down the 10 gadgets that changed the world. Included in the list is the Sony Walkman cassette player which first came out in the late 1970s. It changed the way we listen to our music. Look at all the iPods today. Portable music devices are here to stay and they have to thank the Sony Walkman cassette player for their success. Where will they (or we) be without the Walkmans aye?