Martin 500 3+1 Compensating EuphoniumThe Martin 500 3+1 Euphonium is a free flowing, easy to play instrument that comes at a very affordable price. With precision engineering and high quality brass, this is an instrument that is often compared with far higher priced instruments. The high speed springs and smooth valves are perfect for any level of player. The warm tone is of a professional standard and are a popular choice of teachers and educators.