Maybe you've heard the expression "on the sly"? So talking about something that is done quietly, quietly, so as not to draw attention to themselves. Where has this expression? From music, from accessories of musical instruments. The French word sourdine comes from the Italian sordino, sordo - a dull, muffled sounding. Sardina is a special device, which in musical instruments mute the sound, slightly change the tone.
Different tools mutes come in different shapes and made of different materials. Surdina for stringed instruments is wooden, plastic or metal comb, which is put on the stand. When applied Surdina, the sound becomes weaker, and the tone is not as rich as usual like a Ghost.
Mute for stringed instruments:
And - appearance; B - Surdina cello
The brass instruments - trumpet, trombone and French horn - Surdina made from wood, aluminum or papier-mache in the form of a pear. It is inserted into the socket.
Mutes for brass instruments:
in the pipe - regular cardboard Surdina;
below (left to right): metal pear, jazz Surdina for effect "WHA-WHA", sordina "fungus"
The timpani role mutes out with a piece of cloth that is put on top, and the piano - moderator: a device that lowers the strings of a strip of cloth or thin felt. It is driven by the average foot pedal (tragically instruments).
When you want to play played with mutes, composer mark in music: con sordino; if sordino need to be cleaned, is written: senza sordino.