. The tone is somewhat commonplace as compared with the trumpet, but because of its great agility in the rendition of trills, repeated tones, etc., it is universally used in all sorts of combinations, even (as noted above) taking the place of the trumpet in many small orchestras.
25. The pitch sounded by the trombone is altered by lengthening or shortening the tube of which the instrument is constructed, this being possible because the lower part slides into the upper and can be pulled out to increase the total length of the tube through which the air passes. There are usually three trombones in the orchestra, each playing a separate part, and the combination of this trio (with the tuba reinforcing the bass part) is majestic and thrilling, being powerful enough to dominate the entire orchestra in Fortissimo passages. But the trombones are useful in soft passages also, and their tone when playing pianissimo is rich, serene, and sonorous.
26. The bass tuba is a member of the saxhorn family[42] and supplies the lowest part of the brass choir, as the double-bass does in the string choir. It is used in both orchestra and band, being often supported in the larger bands by a still lower-toned member of the same family—the contra-bass tuba. The range of the tuba is from
to
.