A saxophone is a musical instrument that belongs to the woodwind category. It is one of the youngest musical instruments. Saxophones were generally used in the military and in big orchestras but are now found in smaller bands as well. They are generally used for big band music, pop music and jazz. The saxophone was invented by Adolphe Sax, a Belgian, in the 1840s. Later, many people made their own alterations to the instrument. There are many types of saxophones but the four most commonly used saxophones are: Soprano, Alto, Tenor and Baritone saxophones.