The saxophone (also know as sax) is a family of instruments made of brass but played via a single reed mouthpiece similar to that of the clarinet. Because of that, they are categorized as woodwinds instead of brass instruments. The sax was conceived by Belgian instrument maker Adolphe Sax in the 1840s, when he created two subfamilies of saxophones, which intended to fill the gap between brass and woodwind instruments. There was a family of saxophones conceived for orchestral use, pitched in C and F, which never gained acceptance. The other family was the one with the instruments pitched in Bb and Eb, designed for military bands. This last set of saxophones became extremely popular in a short time, and not only were used in military bands, but also in popular music groups, in jazz (where they became one of the basic instruments of the genre), blues, rock, some forms of folk, and orchestral music.