Here is another well known, and easy to play tune, 'Oh, Susanna'.
Feel free to experiment with your own voices, and backing styles.
Here, I have suggested a Bluegrass version.
As you get confident playing this tune, try speeding up the tempo.
On the Yamaha PSR-E313, this is done by pressing the Tempo/Tap button.
The selected tempo will appear in the display, and can be speeded up, or slowed down, by pressing the '+' or '-' button on the keypad.
If you do this while the accompaniment is playing, you can hear the result as you adjust the tempo.
These instructions are included in the video.