A military band instrument is a type of musical instrument used in military bands. The most common instruments used are the TUBA, fife, and OBOE. The TUBA is a large brass instrument that produces a deep, low-pitched sound. The fife is a small, high-pitched flute-like instrument. The OBOE is a woodwind instrument with a double reed that produces a mellow, sweet sound. All three instruments are essential components of a military band.