PEEP and the Big Wide World Sounds Like Fun is an interactive app designed for kids to explore music and the properties of sound. Developed by WGBH Interactive, this app features the musical stylings of Quack, Peep, and Chirp.

The main feature of the Sounds Like Fun! app is the interactive gizmo that allows kids to mix and match sounds by tapping on characters that represent different musical rhythms. Players can start and stop the rhythms as they choose, creating their own unique compositions.

This open-ended activity not only provides entertainment but also encourages offline exploration. The app is part of the PEEP and the Big Wide World series, which aims to teach science to preschoolers in an engaging and interactive way.