What happens when Frank Gehry designs an organ? Perhaps it comes as no shock that the pipes end up curved. The organ in the Walt Disney Concert Hall, a collaboration between architect Gehry and organ builder Manuel J. Rosales, is being prepared for its debut. The instrument, with its uniquely curved wooden facade (but functional) pipes, was installed last year in time for the opening of the hall, however voicing and tuning on all 6,134 pipes has been taking place since then. The pipes and other parts were made by the Glatter-Götz Orgelbau company of Germany. Now Rosales and his associate are spending many hours tweaking the sounds to perfection.