Fletníčkovi - Who's grumbling here? is a cheerful fairy-tale book with illustrations by Jitka Petrová, with an inserted audio CD (narrator J. Lábus) and a songwriter, containing other of the stories of the Flute family. Families in which they are very cheerful because they like to sing and play. This time, father Bass and his son Tenurk will go to the mountains behind their companions, the bears Fagůtek and Tubíček. And he discovers that he does not live in the mountains in the mountains, what is beauty when the bass sounds, the bear's surprise, and the "mmmm mmmoc" they like. They will cope with the offended roundabout and will resolve this situation.