Launched in 2000 and discontinued in 2001, the Sony eMarker allowed you to mark songs that you heard on the radio so you could buy them later. This $20 keychain had a button and small LCD display. When you heard a song on the radio you wanted to remember, you pushed the button. You could save up to 10 “eMarks.” When you got home, you plugged your eMarker into your computer and fired up a Flash app that cross referenced your time stamp with the radio stations that you said you liked in your area and told you what was playing at the time. It then offered you a link to purchase a CD from Amazon or CDNow. The eMarker was based on the assumption that radio would be the main way people discovered new music. And then users would pay to buy CDs from Amazon. iTunes and the iPod destroyed that world.
