In the location's words:

The Quellenbunker is located at Quellenstraße 42, near the Auer Mühlbach. There are rehearsal rooms for bands and musicians, which are managed by the Glockenbachwerkstatt. One of the rooms is used as a music workshop. Interested parties can try out their musical skills there under professional guidance. All workshops are very inexpensive or free of charge and registrations can be made via the e-mail address: workshops@glockenbachwerkstatt.de.