In this second part of the tutorial, you’re going to add additional functionality like playing and pausing the music, selecting a track from a list inside a ScrollView, and changing the volume with a slider. As you add these features, you’ll learn all about Unity’s built-in UI components.
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/34516499-introduction-to-unity-ui-part-2