The C melody saxophone is a saxophone

Saxophone

The saxophone is a conical-bore transposing musical instrument that is a member of the woodwind family. Saxophones are usually made of brass and played with a single-reed mouthpiece similar to that of the clarinet. The saxophone was invented by the Belgian instrument maker Adolphe Sax in 1846...

 pitched in the key of C, one whole step above the tenor saxophone

Tenor saxophone

The tenor saxophone is a medium-sized member of the saxophone family, a group of instruments invented by Adolphe Sax in the 1840s. The tenor, with the alto, are the two most common types of saxophones. The tenor is pitched in the key of B, and written as a transposing instrument in the treble...

. In the UK it is sometimes referred to as a "C tenor", and in France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 as a "tenor en ut". The C melody was part of the series of saxophones pitched in C and F, intended by the instrument's inventor, Adolphe Sax

Adolphe Sax

Antoine-Joseph "Adolphe" Sax was a Belgian musical instrument designer and musician who played the flute and clarinet, and is best known for having invented the saxophone.-Biography:...

, for orchestral use. Since 1930, only saxophones in the key of B and E (originally intended by Sax for use in military bands and wind ensembles) have been produced on a large scale.