A few months ago I made this.
You tap to place a dot on the notes you want.
When play is tapped, your composition is played.
What used to happen is when restart was tapped at the top right to restart the project, the music composition you just made would stay in the projects memory and play when play was tapped.
The project now restarts properly without the previous composition stored in the apps memory
I'm planning to make creating and replaying music easier to do than this project.
I'm going to make a keyboard and whatever tune the user makes can be replayed again by simply tapping "Replay"
This will be allot of work to do, so it won't be anytime soon.