Things You'll Need
Instructions
Insert your SD memory card into the SD card slot on your computer. If you don't have an SD card slot, insert your SD card into a USB SD card reader and insert the reader into a USB slot. Go to "My Computer" and open the SD card folder.
Launch iTunes and right-click the song that you wish to convert and select "Create AAC Version." The AAC version of your song will appear at the bottom of the original song title. Copy and paste the AAC version of the selected song into the SD card folder or drag the song into the SD card folder. Close all windows and remove the SD card from the slot or remove the USB SD card reader and then remove the SD card.
Insert your SD card into your Nintendo DSi SD card slot on the right side. Turn on your Nintendo DSi. Scroll to "Nintendo DSi Sound" and tap the icon. Select "SD Play With Your Music" icon. Click the SD Card Folder and tap "Open" and choose the song that you wish to play.