The Xyloba is a musical marble run toy. Confused? Stay with me, and you’ll be so glad you did. The Xyloba system has an almost unlimited number of variations for the marble run. But here’s where it gets interesting. In addition to building, your child can compose. As your child gets used to the Xyloba, they can experiment with different note lengths, and melodies can be composed by arranging the way the marbles hit the metal sound modules. It’s such a charming concept, using so many different skills. The Xyloba is recommended for children over the age of four. It comes in three sizes, the Piccolino, Mezzo and Orchestra.