To illustrate this, note that marches are in duple time (2/4 or 4/4 ) giving that "left, ..., left, ..., left, right, left, ..." feel. In contrast to this 3/4 time seems to completely lack that left-right feel, and we therefore frequently associate it with circular motions, like swirling waltzes, or roundabouts at the fun-fair.
Music suggesting a horse galloping or a train ride is fast with more complicated rhythms representing 4 legs or several sets of wheels.
This latter example illustrates that while tempo sets the basic pace of music, there are many ways in which composers can alter and adjust this using different note patterns or rhythms. Syncopation is a familiar example with notes unexpectedly landing "off the beat", which adds complexity and interest to a basic beat, often turning a simple march tempo into a jaunty swagger (see Ragtime). The rhythym of music can qualify the repetitive nature of the underlying beat by suggesting more or less frequent movement. Even though the tempo of a piece of music might be slow and relaxed, a high frequency of notes can suggest a degree of contained excitement within that relaxed state. But the combination of Tempo and Rhythm has an immediate almost physical impact on our perceptions.
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