Tracks disappeared from ipod after sync

<p>Your iPod can function as a jukebox all in the road, with the numbers stored in that you select and manage. To control what the numbers are stored on your iPod, use iTunes software to transfer music to the device. This transfer process is called "sync" your iPod with your computer. If your iPod is synced with iTunes, you can automatically tracks from your music library, or add them manually, depending on the options to enable synchronization. <br /> <p><br /> <p>How can I sync songs automatically? <br /> <p>1. Connect your iPod to your computer. <br /> <p><br /> <p>2. Open iTunes if it does not start automatically. <br /> <p><br /> <p>3. Click your iPod in the iTunes main window. <br /> <p><br /> <p>4. Click the "Music" tab. <br /> <p><br /> <p>5. Check the box next to "Sync Music." <br /> <p><br /> <p>6. Click "Entire Music Library" for all the songs loaded into your iTunes music library on your device to synchronize. <br /> <p><br /> <p>7. Click on "Selected playlists, artists, albums and genres" for some of the music content to sync with your device. Check the boxes for each song or album you want to synchronize the lists that appear when you click this option. <br /> <p><br /> <p>8. Click "Apply" to sync music with iPod. <br /> <p><br /> <p>Syncing manually Songs <br /> <p>1. Click your iPod in the main iTunes window, click the "Summary" tab. <br /> <p><br /> <p>2. Check the box next to "Manually manage music and videos" and click Apply. <br /> <p><br /> <p>3. Click the "Music" option in the "Library" heading on the left side of the screen of iTunes. <br /> <p><br /> <p>4. Drag any number you want to sync to the iPod icon. <br />