A free app for Android, by benanapp.

Organ Instrument is an Android app designed to help you enjoy music and have fun. It features a real organ piano with a variety of enjoyable rhythms. It also has a full electronic organ keyboard with an expandable large keyboard, allowing you to play many notes. Additionally, it includes ready halay, dance and game music rhythms. 

The app also has a music player and voice recorder. The keys are 3D with HD quality and you can choose a theme and background colour. The app works seamlessly on all tablet and phone screen resolutions and provides a professional real electronic piano/organ keyboard set. 

It is completely free to use and offers a great way to enjoy music and have fun.