BUT...
In music, duration refers to the arrangement of sounds in relation to time. This element includes tempo, metre, and rhythm.
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Tempo
The speed of the beat. In Western music, tempo markings will typically be written in Italian.
Metre
...is the pattern of the beats' accents. Where the emphasis lies in the music determines the time signature. In the excerpt below, the emphasis falls as follows:
Rhythm
The organisation of sounds and silences. Rhythms are determined by note values - music can be made up of long sounds, short sounds or even a combination!