The app MusicBook can access:
In-app purchases
* Google Play billing service
Photos/Media/Files
* Modify or delete contents of your SD card
* Read the contents of your SD card
Camera
* Take pictures and videos
Wi-Fi connection information
* View Wi-Fi connections
Other
* Draw over other apps
* Full network access
* Modify system settings
* Prevent tablet from sleeping
* Connect and disconnect from Wi-Fi
* Change network connectivity
* View network connections
The only permission that is classed as 'Dangerous' is the CAMERA permission. The photos which are taken with the app should be scans of lyrics or scores of songs. They are only used in the app for your songs. They are not shared with anyone else, including me.
If you take photos of lyrics or scores you must observe the copyrights of the authors!