Components necessary to create a music player?

Question

Android

What components are needed to create a basic music player and how many? For example, for Yandex Music

Operations (Activity) - to create the visual part
of the Services (Services) - to work in the background
Content Provider (Content Proveder) - to provide data to the application (for example, mp3 files to the file system)
Broadcast receiver - component , which responds to ads distributed throughout the system.