The most popular format of online music today is mp3. For any music lover iTunes need not be the only source of music; Amazon’s Music store is equally good and even comes with a client which will copy the tracks that you buy from the Amazon Music Store into your iTunes so that they can synced up to your iPod automatically. Other sources of music include free mp3 tracks from Magazines and independent artists selling and giving away free music on their own sites. Adding these tracks to your iTunes is an easy enough task and these tracks get copied to your iPod when you connect it.
The simplest way to download music to your iPod is to allow iTunes to manage the music on your iPod. Once you allow iTunes to manage music automatically all tracks,video,audiobooks etc. added to your iTunes client on your desktop or laptop will get automatically synchronized to your iPod.

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In case you've set your iPod to not sync automatically or opted to manage your iPod manually from the above screen (by selecting the third option), connect your iPod to your computer and launch iTunes (if it hasn’t automatically launched).On the left you will see iPod displayed under Devices in the left window. Click on the iPod.

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Now to dowload music to your iPod all you have to do is to drag & drop the files into your iTunes application window. After you have dropped the music files into iTunes, select the iPod from the devices and click on the synchronize button on the right window. Your music will be copied to your iPod and ready to go once the sync is over.

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The Sync button is located to the extreme right of iTunes iPod Devices screen as shown above. The button is only clickable when there are unsynced tracks for the iPod.
Now that you know how to download music for the iPod, go ahead and buy some or get some music tracks for free, and rock out!

