Brass instrument can be very useful for a 1st or 3rd horn player, who uses the F side less. Another approach was the addition of two sets of slides for different parts of the range. Some euphoniums and tubas were built like this, but today, this approach has become highly exotic for all instruments except horns, where it is the norm, usually in a double, sometimes even triple configuration. Some valved brass instruments provide triggers or throws that manually lengthen (or, less commonly, shorten) the main tuning slide, a valve slide, or the main tubing. These mechanisms alter the pitch of notes
Pitch of brass instruments valve that puts it into E, and when combined, these put the instrument into the key of B. The B contrabass is often fitted with a valve in F and has been fitted with both a valve in F and G, so that it matches its bass trombone counterpart, but is pitched an octave lower. See Types of trombones The bass tuba is commonly available in F and E, while contrabass tubas are available in C and B. Pitch of brass instruments The pitch of a brass instrument is determined by its vibratory length, which determines the fundamental frequency of