By the time kids get to Level 3, they are playing songs, writing songs, and are excited to learn more (and meet new Friends)!
For you teachers, when you get to Level 3, you want to take the time to start really emphasizing the correct way of doing things.
Maybe you let some things slide in the earlier levels, but the books, the characters, and you are starting to get more serious about playing correctly.
That being said, I hope you are still having fun with the content. The new Friends bring a lot of joy and clarity to the kids. They also open up a lot of room for the kids to play in different positions.
With their growth, the characters also grow, with the Monkey becoming the rule-following instructor known as the Monkey Lawyer.