Tubular bells

Tubular bells (also known as chimes) are musical instruments in the percussion family. Their sound resembles that of church bells, carillons, or a bell tower; the original tubular bells were made to duplicate the sound of church bells within an ensemble. Each bell is a metal tube, 30–38 mm (1+1⁄4–1+1⁄2 in) in diameter, tuned by altering its length. Its standard range is C₄–F₅, though many professional instruments reach G₅. Tubular bells are often replaced by studio chimes, which are smaller and usually less expensive instruments. Studio chimes are similar in appearance to tubular bells, but each bell has a smaller diameter than the corresponding bell on tubular bells.

Tubular bells are usually struck on the top edges of the tubes with a rawhide- or plastic-headed hammer. A sustain pedal may be attached to the instrument to allow damping and un-damping of all the bells at once. Very loud high-pitched overtones can be produced by vibrating the bottoms of the tubes with a violin bow.

The tubes provide a purer tone than solid cylindrical chimes, such as those on a mark tree.

Chimes are often called for in orchestral and concert band repertoire. They rarely play melody, instead being used most often as a color to add to the ensemble sound; but chimes do occasionally have solos, particularly in imitation of church bells.

In tubular bells, modes 4, 5, and 6 appear to determine the strike tone and have frequencies in the ratios 9²:11²:13², or 81:121:169, "which are close enough to the ratios 2:3:4 for the ear to consider them nearly harmonic and to use them as a basis for establishing a virtual pitch". The perceived "strike pitch" is thus an octave below the fourth mode (i.e., the missing "1" in the above series).