Robby Robin Finds the Missing Eighth Note

Robby Robin loves going to his music class. But the oak tree where Mr. Owl's music class meets in has many mysteries. Suddenly, a big knot on the tree starts to move and rumble.

What's going on? All the birds and the music notes wonder, "What's causing the tree to make such a noise?" It's up to Robby to unlock the mystery. His adventure continues...