1. Little Star: This is a very classic children's song. The melody is easy to learn and the lyrics are easy to understand. Very suitable for children aged three and a half.

2. "Two Tigers": This song has a light melody and simple lyrics, which is very suitable for children to learn to sing.

3. "Twinkling Star": This song has beautiful melody and simple lyrics, which is very suitable for children to learn to sing.

4. "Pulling Radish": This song has a bright melody and interesting lyrics, which is very suitable for children to learn to sing.

5. "Little White Rabbit Darling": This song has a warm melody and simple lyrics, which is very suitable for children to learn to sing.

6. "Find a Friend": This song has a cheerful melody and educational lyrics, which is very suitable for children to learn to sing.

7. "Little Swallow": This song has a beautiful melody and simple lyrics, which is very suitable for children to learn to sing.

8. Little Bee: This song has a lively melody and interesting lyrics, which is very suitable for children to learn to sing.

9. "Little Donkey": This song has a cheerful melody and educational lyrics, which is very suitable for children to learn to sing.

10. Birds and Sparrows: This song has beautiful melody and simple lyrics, which is very suitable for children to learn to sing.