NOTE: If you're using a MAC, see answer ID 1141
METHOD 1 - Refer to the following instructional videos and articles for using Windows Media Player to transfer music and playlists.
How-to Videos for Windows Media Player
Rip audio CDs, create playlists and transfer music to a Sansa player using WMP 12
Rip audio CDs, create playlists and transfer music to a Sansa player using WMP 11
Syncing and transferring music files to the Sansa player using WMP 10
METHOD 2 - Copy & paste or drag & drop music files to the player through "My Computer".
1. Connect the Sansa player to the computer.
2. Double-click My Computer.
3. Locate and select the music file(s) to be copied to your Sansa player .
NOTE: You can select multiple files by holding the CTRL key down while clicking files. You can also select all the files on that particular folder by holding CTRL key then pressing A.
4. On your keyboard, hold the CTRL key then press C to copy.
5. Under My Computer, double-click the Sansa player.
NOTE: If the Sansa player is connected in MSC mode, you will see something similar to the image below:
If connected in MTP mode, you will see something similar to this:
6. Locate the Music folder and double-click to open.
NOTE: In MTP mode, you may need to double click on Internal Memory to get to the MUSIC folder.

7. Hold down the CTRL key on the keyboard then press V to paste the music files.
