Our district has several different sizes of music rooms. As a traveling teacher, I use three different rooms in different buildings. The smallest room, on a stage, needs to be extremely flexible as others frequently need the room. The other two rooms are quite large, but they also need to be flexible as the band also meets in the room.
This video shows a 360 degree view of one of those classrooms packed up for the summer. On the wall with the clock and the long shelves is where the Orff instrumentarium is usually placed.
The back left corner is also the entrance to the elevator so a clear path is needed for access for students on crutches or in wheelchairs.
The back right corner has all of the necessary music stands. Chairs for band are in one of the storage rooms and need to be available twice a week.
Of the three practice rooms, one is the other music teacher's office, one is her storage room, one is my storage room. At this point, they are unable to use for student space, although I might be able to get creative with my storage space.
Link to Video:
https://www.youtube.com/watch?v=5jUPWMGw4ks