The original Sony Walkmans used cassette tapes and the branding has since expanded to many other portable music offerings, including a Walkman line of music-centric mobile phones.
Unlike Walkmans and Discmans, MP3 players are digital, so you never have to carry around anything but the device like you would with a portable CD or cassette player.
Eventually, a deal was worked out between cassette manufacturers and the industry that a penny from each blank cassette sold would go into the industry pot.
CD Changers and Players: Because cassette players are almost obsolete, you should try to find a discount car stereo that includes a CD player.
Over the years, these three clubs went through transitions - different owners, making the transition from vinyl to cassette, licensing law changes - but they remained powerful forces in the music industry.