In musical terminology, tempo (Italian for "time"; plural tempos, or tempi from the Italian plural) is the speed or pace of a given piece. In classical music, tempo is typically indicated with an instruction at the start of a piece (often using conventional Italian terms) and is usually measured in beats per minute (or bpm). https://en.wikipedia.org/wiki/Tempo

Also a Venkatesh Rao book. https://www.ribbonfarm.com/tempo/ ISBN:0982703007

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