The Music app is a stock application that comes preinstalled on all iOS devices. It's the primary way for playing music on the iPhone, iPod touch, and iPad. With iOS 7.0, a new feature was baked into the stock Music app called iTunes Radio. iTunes Radio is an ad-supported service that allows users to browse more than 250 curated stations. Users can also create and build their own stations, which feature Pandora-like customization over time.

The stock Music app has endured significant changes over the past few years. The Music app was once exclusively relegated to the iPod touch, with iPhone models offering an "iPod" app as a means to play music and watch videos. Eventually, with the advent of iOS 5, the iPod app was broken-up into separate Music and Video apps for the iPhone line, unifying the stock Music app presence across all iOS hardware.

While there are many ways to play music via third-party apps on iOS, the stock Music app is the only music application that's closely integrated with iTunes and allows you to use the iTunes Match iCloud-hosting service. There may be benefits to other apps like Spotify, but no app is as tightly intertwined with the rest of iOS as the stock Music app. With that in mind, please take a look inside, as we break down the many facets of this ever-growing and ever-changing stock application.