RvPiano.

RvPiano.
Play and record music on your mobile piano, and then send the music to the Arduino buzzer via Bluetooth.

Instructables Complete Instruction: https://www.instructables.com/id/RvPiano-Music-From-App-to-Arduino/

film:
Ultrasonic Gesture Control Video: https://goo.gl/4cxYoD

Record, play, save, read and send music: https://goo.gl/fJDCCn

Delphi / Arduino Source Code, Schematics full download.

http://www.rasvector.url.tw/Download%20Pages/Download_Arduino.htm
http://www.rasvector.url.tw/Download%20Pages/Download_Arduino.htm