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In musical terminology, tempo (:ˈtɛmpo) ("time" in Italian; plural: ''tempi'' (:ˈtɛmpi)) is the speed or pace of a given piece or subsection thereof. ==Measuring tempo== A piece of music's tempo is typically written at the start of the score, and in modern Western music is usually indicated in beats per minute (BPM). This means that a particular note value (for example, a quarter note, or crotchet) is specified as the beat, and that the amount of time between successive beats is a specified fraction of a minute. The greater the number of beats per minute, the smaller the amount of time between successive beats, and thus faster a piece must be played. For example, a tempo of 60 beats per minute signifies one beat per second, while a tempo of 120 beats per minute is twice as rapid, signifying one beat every 0.5 seconds. Mathematical tempo markings of this kind became increasingly popular during the first half of the 19th century, after the metronome had been invented by Johann Nepomuk Mälzel, although early metronomes were somewhat inconsistent. Beethoven was one of the first composers to use the metronome; in the 1810s he published metronomic indications for the eight symphonies he had composed up to that time.〔Some of these markings are today contentious, such as those on his "Hammerklavier" Sonata and Ninth Symphony, seeming to many to be almost impossibly fast, as is also the case for many of the works of Schumann. See "metronome" entry in Apel (1969), p. 523.〕 With the advent of modern electronics, BPM became an extremely precise measure. Music sequencers use the BPM system to denote tempo. Instead of beats per minute, some 20th-century composers (e.g., Béla Bartók, Alberto Ginastera, and John Cage) specify the total playing time for a piece, from which the performer can derive tempo. Tempo is as crucial in contemporary music as it is in classical. In electronic dance music, accurate knowledge of a tune's BPM is important to DJs for the purposes of beatmatching. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「tempo」の詳細全文を読む スポンサード リンク
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