There are no sounds for most of the instruments seen on stage.
After Scum of the Earth throw the bellboy out of the window, they ask Johnny Fever what floor they are on. Johnny responds by saying "First". However, when the bellboy goes out the window, you can see a vertical building sign that says "Antiques" outside that is obviously extending down below their current floor level, so they obviously are not on the first floor. Those types of signs generally extend from the third to the fifth floors, so they threw the bellboy out from at least 25 or 30 feet up. This would have seriously injured him being thrown from this height.