1. Connect both iPods to your computer using USB cables.
2. If prompted to import files, close the import dialog box.
3. Use the file manager or file explorer on your computer to navigate to the Music or iTunes Media folder on each iPod.
4. Select the files you want to transfer from one iPod to the other and drag-and-drop them to the appropriate folder on the other iPod.
5. Once the files have been transferred, safely disconnect both iPods from your computer.
To download music from a CD without erasing music on your iPod, you can use a computer with iTunes installed. Follow these steps:
1. Insert the CD into your computer's optical drive.
2. Open iTunes and click on the "Music" tab in the menu bar.
3. Click on the "Import CD" button in the upper right corner of the iTunes window.
4. Select the songs you want to import and click on the "Import" button.
5. Once the songs have been imported, you can connect your iPod to your computer and sync your music.
6. To sync only newly added songs, select the "Sync only checked songs and videos" checkbox in the "Music" settings tab.