The mouse Maximus Musikus was only searching for a quiet place to sleep.

Maxi’s peace is however brought to a swift end the next morning: the mouse boy has landed in a concert hall and now encounters the adventure of a lifetime. Maxi gets to know the instruments of the orchestra and listens to the rehearsals and a concert.

Then when they all play Maxi’s Song, he dances enthusiastically along with all the children in the audience.