As a player, Oliver took great interest in altering his horn's sound. He pioneered the use of mutes, including the rubber plumber's plunger, derby hat, bottles and cups. His favorite mute was a small metal mute made by the C.G. Conn Instrument Company, with which he played his famous solo on his composition the "Dippermouth Blues" (an early nickname for fellow cornetist Louis Armstrong). His recording "Wa Wa Wa" with the Dixie Syncopators can be credited with giving the name wah-wah to such techniques. This "freak" style of trumpet playing was also featured in his composition, "Eccentric."