Each note has a corresponding rest in duration. There is a syncopation when the notes are played on beats which are normally unaccented and they are extended more of the accent. One of the effects that defines the rhythm music is producing to advance the beat of a important note that normally pplays in strong beat. The syncopation and the counterpoint notes changes the initial accents. There are many ways of synthesising sounds.
Electronic apparatus generates or processes sound to reproduce it.
The radio, cassette player and CD reproduce sounds represented by fluctuations of electricity. The most common methods of representing sounds are analogue and digital. The information consists of oscillations in electrical tension reproduced in analogue - imitations of sound waves travelling through the air. Usually the synthesizer takes the form of an electronic keyboard with buttons to control the timbre. There are programmable and non-programmable synthesizers.