A mute for a horn-type musical instrument is disclosed. The mute having a freely resonating body including an opening therein to permit air flow into the body, the body having n number of first facets wherein n is an integer from 3 to 99 and having o number of second facets wherein o is an integer from 1 to 99. The mute changes the timbre of the sound generated by the instrument, yet maintains the majority of the volume of sound prior to placement of the mute into the bell.