If you are a big company: please take reservations and call your customers back.
Since I know companies are too lazy to do that. If you are a developer: please make a nice web app that calls Bank of America for you and listens to that stupid music and repeats in a soothing voice:
"hello. I am an automated waiting on hold service. My client is important to you. When you are availiable, please call my client at 555 5555 to answer their question. Press 1 and I will connect you automatically.hello. I am an automated waiting on hold service. My client is important to you..."