Let’s say you wanted to listen to a specific song. Let’s say David Bowie’s “Young Americans.” When the song was released in 1975 you would have had two options: wait for it to be played on the radio or buy the record (or eight track). Ten years later you had the option of recording the song on cassette tape from a friend’s copy or even recording it straight from the radio. Ten more years and you could have made your own mix from your collection of cutting-edge compact discs and burned copies for your friends. If you were especially ...