What is the demo music of casio ct-615?

Here are some of the demo songs that come preloaded on the Casio CT-615 keyboard:

Bank A:

- Rhythm 1: "Jingle Bells"

- Rhythm 2: "Frere Jacques"

- Rhythm 3: "London Bridge is Falling Down"

- Rhythm 4: "Mary Had a Little Lamb"

- Rhythm 5: "Twinkle, Twinkle, Little Star"

- Rhythm 6: "Yankee Doodle"

Bank B:

- Rhythm 1: "We Wish You a Merry Christmas"

- Rhythm 2: "Happy Birthday to You"

- Rhythm 3: "For He's a Jolly Good Fellow"

- Rhythm 4: "Amazing Grace"

- Rhythm 5: "Silent Night"

- Rhythm 6: "Joy to the World"

There are also several additional demo songs that can be accessed by selecting the "Demo" button on the keyboard.