If you are familiar with Windows Explorer (File Explorer in Windows 10) you can just drag music from your computer and drop it in the Music folder under the player. But I found that this took a long time, even with a fast computer. I think using Windows Media Player is the easiest, fastest way. Open Media player then plug the sandisk in using the usb cord provided. Click on the Sync tab in Media Player (upper right side) and drag the songs you want to put on it from the Music library in Media Player (left side) to the empty box on the right side. Click on Start Sync (under the Sync tab) and the songs will transfer all by themselves! You can go watch a movie or something while it works!