In the Musiksaal (music hall), the heart of the MUSIKINSEL, seminars with up to 120 participants can be held. This modern hall receives light from both the north and south. Both end walls are covered with a mixture of absorbing and reflecting acoustic elements. Spotlights, microphones, beamers, etc. can be placed in position along two ceiling rails.

The orchestra foyer below is conveniently reached through dedicated stairs.