D.W. Beats All & Buster the Myth Maker

D.W. Beats All: When the Tibble Twins get a set of drums and decide to perform the Summer Serenade Festival, D.W. wishes that she has an instrument of her own to play, and ultimately creates her own instrument.
Buster the Myth Maker: After finding that Siberian Tigers are living in Turkey Hill Park, Arthur and Buster decide to investigate. However, the myth turns out to be a hoax, set up by The Brain as an experiment.