Beat

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“Beats can be defined as audible pulse markings, which would imply marking off time units of equal duration… Beats can also be defined even more subtly as time points often (but not always) represented by musical events (Snyder 2000). They must have precise attack points where the sound event begins to be classified as beats. They are time points of no duration, having only temporal positions… They can be simultaneous with the underlying pulse, but can also deviate from it in slight shifts.”

(Thaut 2008, pg. 8)