How to Buy Music From the iTunes Store. Buying music from iTunes is a simple process that will keep your iTunes as unique as you are. Many users enjoy browsing through songs, while others know exactly what they are looking for. Either way, follow these steps and you will be able to add new songs to iTunes whenever you are ready for a change.
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In the "Source" pane, click on the iTunes Store.
You can either browse by entering information into the search box or enter a specific title.
Once you find your song, click the "Buy" button.
Your song is now downloaded.