Dear user, we apologize for the inconvenience.
Some music is purchased through Itunes and protected by DRM (Digital Rights Management).
The IOS App does not have permission to read the contents of music files, so it cannot achieve the function of music beating.
You can add music in the following 2 ways:
1 Use the "import from PC" function to add music.
2. Please download music on your computer, and then sync to your phone with itunes, so it can play.
It is recommended to use the microphone function of the App. Press the Home button to bring the app back to the background, and then use other music player apps to play music to achieve the effect.