Ubiquity Music Widget is a free universal music widget for Android 4.4+ developed by jathak. It is a clean and simple widget that works with any music player that displays controls and album art on the lock screen. The widget automatically switches between different music players, making it easy to use for those who switch between multiple music apps. The source code is available on GitHub, and all plus features are free as of version 2.0.3.

It is important to note that the widget will not work until the user goes to Security > Notification access in settings and checks "Ubiquity Music Widget". Once this step is completed, the widget is easy to use and provides a convenient way to control music playback on Android devices.