What are they?
Trombones are Brass instruments which have a large 'slide' rather than individual valves to control the pitch of the instrument.
The most common form is the tenor trombone which is pitched in a Bb tone.
There are also Bass trombones which are similar to the tenor but tend to be louder due to the larger bore.
Example of a Bass + Tenor Trombone
Our Trombone Section