MusicEditor: Allyson Kazmucha
Apple's Music app is one of the original dock apps on the iPhone, iPod touch, and iPad. On the iPhone it was originally called the iPod app, and included video content as well as audio, but later split off into Music and Video apps to match the iPod touch and iPad. Nowadays the Music app is also home to iTunes Radio, Apple's own music streaming service. The Music app on the iPhone, iPad, and iPod touch also seamlessly integrates with both iTunes in the Cloud and iTunes Match.
To use the Music app on an iPhone, iPad, or iPod touch you can buy content straight from iTunes, sync it through iTunes for Mac or PC, or subscribe to iTunes Match for a yearly fee in order to match your existing iTunes library and stream it without eating up any storage. Siri also ties into the Music app so you can ask it to play any song, album, or track you have on your iPhone or iPad. You can also enable automatic downloads for new song purchases within the Settings app so your music library is always up to date across all the devices you own, all the time.
The Music app received a re-design in iOS 7 on the iPhone that gave it a similar design to the iPad app. Most of the changes made were visual and the way you use and interact with the Music app has very much remained unchanged. You can still customize the bottom navigation to show the items you prefer just as you could prior to iOS 7.
All iPhones, iPads, and iPod touches come with the Music all built right in so there is nothing to download. The same holds true for the Videos app. However, if you're interested in podcasts, you can download the Podcasts app as a separate download in the App Store.