Sordino, with alternative forms sordono and sordun, etc., is an Italian term somewhat promiscuously applied by various writers:

#to contrivances for damping or muting wind, string and percussion instruments (sordino);
#to a family of archaic wind instruments blown by means of a double reed (sordone or sordun, etc.); and
#to a string instrument.

To these must also be added the "surdellina" or "sordellina", a kind of musette invented (see bagpipe) in Naples in the 17th century, and evidently named after class 2.

Variant forms of the word

The primary Italian word in use in these specialised terms is a feminine noun: "sordina", with plural "sordine"; but in international musical terminology a masculine form is much more common: "sordino", with plural "sordini". The Italian word is derived as a feminine diminutive of the adjective "sordo" ("deaf", "dull in sound"), ["Oxford Paravia Dictionary", 2nd edition, 2006] from Latin "surdus". The alternative forms given above would have as plurals "sordini", "sordoni", "sorduni". The French version of the word is feminine, and is sometimes used in music notation also: "sourdine", plural "sourdines". Other languages' versions are also feminine: Spanish has "sordina", plural "sordinas"; Portuguese has "surdina", plural "surdinas".

Dampening musical instruments

The mutes or dampers used with stringed instruments, such as the violin, and the dampers of the piano and related keyboard instruments, are all well known, and described in articles for the instruments themselves. As a certain amount of misconception exists concerning the sordini (Fr. "sourdines", Ger. "Dämpfer"), used from the 16th century with the trumpet and later with the horn, they may be briefly described. It would appear that the art has almost been lost of making mutes for trumpets and French horns, which should affect the timbre only, giving it a certain veiled mysterious quality similar to that of the Ions beaches or handstopped notes, but affecting the pitch not at all. We read that when it is necessary to produce this peculiar timbre on the valvehorn, as for instance in Richard Wagner's "Rheingold", the rise of a semitone in pitch caused by the introduction of the mute or the hand into the bell of the horn must be compensated by means of the second piston which lowers the pitch a semi-tone.

If the sordino used early in the 17th century had had this effect of raising the pitch, the fact would have been stated by such writers as Mersenne and Michael Praetorius; it would, moreover, have rendered the mute useless with instruments on which no sort of compensation was possible. H. Domnich and J. Fröhlich, however, describe the sordino which leaves the pitch unaffected: it consisted of a hollow cone of wood or cardboard, truncated at the apex to allow the air to pass through and escape through a hole in the base. The bore of the instrument thus continued through the cone of the mute was the essential point, and the proportions to be maintained between the diameters of the two bores were also, no doubt, of importance. Domnich expressly states that it was when Hampel substituted a plug of cotton-wool (therefore solid and providing no central passage for the air) for the mute, that he found the pitch of the horn raised a semi-tone. Domnich's evidence is of value, for hidther was a horn-player contemporary with Hampel, and he himself was the intimate friend and colleague of Punto, Hampel's most celebrated pupil.

Ancient instruments

The sordun or sordoni family are often confused with the "dolcians" (Fr. "courtaud", Eng. "single curiail", Ger. "Kort" or "Kortholt"), from which, however, they differed radically. This difference was not understood by Praetorius, who acknowledges his mystification. The contra-bass sordun, he says, hardly half the length of the contra-fagotto, is yet practically of the same pitch, which is astonishing since the bore is only double once upon itself as in the fagotto. The kort likewise is of the same size as the bass sordun, and yet in pitch it is but a tenor.

The following description of the construction and acoustic properties of the sordoni will clear up the mystery. The body consisted of a cylinder of wood in which were cut two parallel channels of narrow cylindrical bore, communicating with each other at the bottom through a bend, but not with ambient air. At the top of the cylinder was fitted a double-reed mouthpiece giving access to the column of air at one end of the bore, while the other was vented through a small hole in the side, similar to the finger-holes; in the tenor, bass and contra members of the family, the reed was attached to a curved brass crook similar to that of the fagotto. So far the description would almost apply to the dolcian also, but in the latter there is the radical difference that the bore of the channels is conical, so that it has the acoustic properties of the open pipe. The sordun, however, having a cylindrical bore, has the acoustic properties of the stopped pipe, i.e. the sound waves are twice the length of the pipe, so that to produce a sound of any given pitch, for instance for C, the bore need only be half the length, i.e. 4 ft. long. Overblowing, on the sordoni, moreover, produced as first harmonic (the only one required for reed-blown instruments in order to produce the diatonic scale for the second octave) not the octave, but the twelfth, or number 3 of the series. This accounts for the fact that instruments of the fagotto and dolcian type require but six or seven holes to give the diatonic scale throughout the compass, whereas the sordoni require 11 or 12 holes. Praetorius states that those figured by him have 12 open holes, and that some specimens have in addition two keys; a hole is also bored through the bottom of the instrument to allow the moisture condensed from the breath to be shaken out. The 12 holes are stopped by means of fingers and thumbs and by the ball of the hand or the fleshy underpart of the joints of the fingers.

Two sourdines belonging to the Museum of the Brussels Conservatoire, said to be facsimiles of some instruments belonging to the emperor Maximilian I's band, are reproduced in Captain U. R. Day's "Descriptive Catalogue of Musical Instruments" (London, 1891). They differ slightly in construction from the Italian instruments described by Praetorius. The straight crook is set in the side of the instrument, almost at right angles, the top of the cylinder is surmounted by a cap, and there are but 6 open holes, the rest being covered by brass keys in wooden boxes. The pitch of these instruments lies within a semi-tone of that of the contra-bass and bass of Praetorius.




ee also

* List of musical terminology
* Sustain pedal
* Soft pedal

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