Mouthpiece for woodwind instruments with venturi aperture

A woodwind mouthpiece comprising:

• a central bore passing through the mouthpiece;
• a tone chamber in communication with the central bore and comprising a bottom surface;
• a window exposing the tone chamber;
• a pair of side rails extending along opposite sides of the window, each side rail comprising a side rail top surface and an interior surface running from the top surface to the bottom surface of the tone chamber;
• a tip rail extending between the side rails, the tone chamber extending from the tip rail to the central bore;
• a tone chamber width defined by a distance between the interior surfaces of the side rails, the tone chamber width greater at the side rail top surface than at the bottom surface of the tone chamber along an entire length of the tone chamber from the tip rail to the central bore;
• and
• a bottom surface width defined by a distance between the interior surfaces of the side rails at the bottom surface, the bottom surface width greater at an end of the tone chamber adjacent the tip rail than at an end of the tone chamber adjacent the central bore;
• wherein the tone chamber width and the bottom surface width focus energy along their centerlines to increase coupling between an air column in the tone chamber and a reed placed over the window to increase power and to improve intonation in the woodwind mouthpiece.