The Thun City Music School is located in the beautifully preserved castle in Gwatt (Thun). In the venerable rooms of the castle there are both offices and classrooms for music lessons with a wide variety of instruments. Especially in the rooms for lessons with wind instruments, the sound level is temporarily very high and can also have negative health consequences, especially for the teaching staff. That is why acoustic measures have been implemented in some rooms to reduce the sound level and break the sound peaks. So it is now possible to design and conduct lessons in a relaxed manner without any health consequences.