What Instruments Use a Single Reed

The type of instruments that use a single reed are clarinets and saxophone. The timbre of a single and double reed instrument is related to the harmonic series caused by the shape of the corpus. E.g. the clarinet is only including the odd harmonics due to air column modes canceling out the even harmonics.

Which orchestral instrument has a single reed?

The Single Reed instruments are: the Clarinet family and, exceptionally in the orchestra, the Saxophone family. Regarding the Double Reed instruments, they use a cane folded double wrapped on a metal tube.

What instruments need two reeds?

The main musical instruments that use a double reed are the Oboe and the Bassoon. And there are others such as the Cor Anglais popularly known as the English horn and the contrabassoon that are bigger brothers of the oboe and bassoon respectively as well as some ancient instruments like the shawm and the racket.