What are the letters to an easy song on piano?

Here are some simple piano songs with their corresponding letters:

1. "Twinkle, Twinkle, Little Star":

Letters: C - C - G - G - A - A - G

2. "Mary Had a Little Lamb":

Letters: C - C - D - D - E - E - D - C

3. "Happy Birthday to You":

Letters: C - D - E - F - G - A - G

4. "Old MacDonald Had a Farm":

Letters: C - D - E - F - G (repeat for each animal verse)

5. "Do Re Mi" (from The Sound of Music):

Letters: Do (C), Re (D), Mi (E), Fa (F), So (G), La (A), Ti (B), Do (C)

6. "Jingle Bells":

Letters: C - G - A - G - F - E - D

7. "Silent Night":

Letters: C - C - G - G - A - A - G

8. "Ode to Joy" (from Beethoven's 9th Symphony):

Letters: D - E - F - D - E - F - D - C

9. "The Itsy Bitsy Spider":

Letters: C - D - E - E - D - D - C

10. "Frère Jacques":

Letters: C - C - G - G - A - A - G