An attachment is provided, which is to be clipped to the bell of a contemporary wind instrument, hereinafter called a horn, such as a trumpet, trombone, euphonium, etc., permitting musical playing by lip control alone, eliminating the need for valves, or scale slides. An attachment bracket is designed to support one, or more, tubular waveguide reflectors. The waveguide reflectors each have a proximal end near the bell end of the horn and extend relative to the horn's mouthpiece, toward a distal end, at a calculated position, producing a fundamental pitch of one scale tone lower or higher, as may be required, from the fundamental pitch of the horn. A single port may be added to the horn calculated to produce a fundamental pitch, one tone higher than the fundamental pitch of the horn, providing the sharps and flats for a full chromatic scale.