By pressing the highlighted keys, you can enjoy playing outstanding music. without crook, Bell diameter 5 in. In orchestras, there are usually three trombones, and their range matches that of cellos and bassoons. lengthen or shorten the tubing. If you are interested in playing this wonderful instrument, you should first do some research on it. In short, brass instruments are like long pipes that widen out at the end into a bell shape. Length approx. // -->