Types
The most frequently encountered trombones today are the tenor and bass, though as with many other Renaissance instruments, the trombone has been built in sizes from piccolo to contrabass.
Trombones are usually constructed with a slide that is used to change the pitch. Valve trombones use three valves (singly or in combination) instead of the slide. The valves follow the same schema as other valved instruments-the first valve lowers the pitch by 1 step, the second valve by 1/2 step, and the third valve by 1-1/2 steps.
Some slide trombones have one or (less frequently) two rotary valves operated by a left-hand thumb trigger. The single rotary valve is part of the F attachment, which adds a length of tubing to lower the instrument's fundamental pitch from B♭ to F. Some bass trombones have a second trigger with a different length of tubing. The second trigger facilitates playing the otherwise problematic low B.
Read more about this topic: Trombone
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