The symphony orchestra is a unique polyphonic instrument controlled by the master-conductor.
The maestro comes on stage, and all noise in the hall fades away with his appearance. One movement of his baton, and the concert begins …

In order to control a large musical band, to build a composition of genius out of the chaos of sounds, an orchestra needs a conductor. He determines the pattern of the sound of music, prepares the composition with the performers, shows when this or that instrument needs to start playing.