From the home screen, tap iTunes Store.
Browse music, tv shows, or movie selections by genre or tap Search to find specific content.
Tap the Search field.
Enter the preferred search, then tap Search.
Scroll down to view more songs and albums from this artist.
Tap on an item to see more details or tap the price to purchase an item directly.
Tap BUY SONG.
If prompted, enter the Apple ID password, then tap OK.
The item will begin downloading.
To view the downloads screen, tap More.
Once the download is completed, tap Purchased to view a list of all purchased songs.
Tap a track to play it.
The track will be played automatically.