Plug one end of the Samsung Gravity USB cable into an open USB port on your computer.
You can load your music onto the Samsung Gravity to enjoy it wherever you take your phone. The Gravity features the Android operating system, which allows you to load files through an additional memory card or through the USB transfer interface. Connect your Samsung to your computer to use the native Windows utilities to transfer your music files to the Samsung Gravity's internal storage drive.
Insert the small end of the Gravity's USB cable into the port on the side of the phone.
Tap the "Notifications" icon on the Samsung's menu bar and drag it down. Tap the "USB Storage" option and press the "Mount USB" button. The phone will appear as a "Removable Disk" on your desktop. Double-click the icon to access the Samsung's internal storage drive.
Open the folder that stores the music files on your computer. Click on a music file and drag it into the Samsung's folder. Wait for the files to be completely copied to the drive.
Click the "Safely Remove Hardware" icon on your Windows task bar and click the "Eject" button under the "Removable Disk" entry to eject the phone and complete the upload process.