It's a purple app with a white musical note inside a white circle.

You need to connect to a Wi-Fi network with to use this method.
 You can do this in a few ways:

Tap Search. It's a magnifying glass icon in the lower-right part of the screen.
Do this if you're searching for a specific song, artist, or genre, then tap the "Search" field at the top of the screen. Type the title, artist, or keyword in the field, then tap the result you're looking for.
Tap Music. It's a musical note icon in the lower-left corner of the screen.

Do this to browse through songs, albums, artists, ringtones, and genres on the iTunes Store.
 To download a song or album, tap the price next to the title., This button will appear in the same place as the price button. Tapping it confirms your purchase. The music you purchased will begin downloading to your iPod.

Look for purchased music in the Music app, under the "Downloaded Music" tab in the Library.
Open the iTunes Store app.
Find music.
Tap the price.
Tap BUY (MEDIA).
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