You need to transfer music from your computer to your Walkman in order to listen to music on the Walkman. After importing songs from a CD or your computer to Media Go, use Media Go to transfer them to the Walkman. You can also transfer them by drag-and-drop from Windows Explorer. For a Mac computer, you can use Content Transfer to transfer the songs from iTunes, etc. You can also transfer them by drag-and-drop from the Mac Finder.