Rhythm
Music is composed of strong beats and weak beats. The first beat is always strong and is followed by a weaker beat. In 4/4 time, the beats follow a Strong Weak Medium Weak pattern and in 3/4 time, the pattern is Strong Medium Weak. Many songs that are written have a 4/4 meter, and sometimes the meter of a song can change. In addition to the choice of meter, the choice of instruments can have a profound effect upon the feel of a piece of music. Meter, tempo and instrumentation all work together to form movement.