Is it permissible to own wooden decorative pieces that produce musical sounds when struck by the wind?

Natural sounds not originating from "musical instruments" fall into three categories: 1. A sound in which humans have no influence: Permissible to listen to. 2. A sound produced by human action but not conforming to musical rhythms and melodies (like knocking on wood): Permissible. 3. A sound produced as a result of human craft, conforming to musical rhythms and melodies: It takes the ruling of music.

Therefore, if wooden pieces are arranged to produce a musical sound when the wind blows and they collide, this sound takes the ruling of forbidden music. However, if the sound is merely the collision of wooden pieces with each other and is not musical, there is no harm in listening to it.