The first phonographs recorded sound onto a tinfoil sheet cylinder. With the invention of the phonograph, people could listen to music without going to see an orchestra.
The iPod was invented by Apple, and unveiled on October 23, 2001. They are much more compact than phonographs or CDs. With an iPod, you can listen to music whenever, wherever you want.
People are working on apps that allow you to interact with music. To take a song and speed it up, skip it, slow it down, and rewind it. Some even allow you to play and repeat a song endlessly, or switch the drummer. There is one that allow you to make a road trip playlist, based on where you're driving through and which musicians are from that area.