| Description | The valve trombone has been built in every size from alto to contrabass, though it is the tenor valve trombone which has seen the most widespread use. The most common valve-trombone has three valves. It plays just like a trumpet (an octave lower). They are built in either short or long form. |
| On Wikipedia | https://en.wikipedia.org/wiki/Types_of_trombone#Valve_trombone |
| Parent instrument | Trombone |