Before the metronome, the German composer/flautist Johann Quantz (1697-1773) defined the use of tempo markings in his treatise on flute playing (which also includes other information on 18th century performance practice). He used the human pulse of 80 beats a minute as his guide and divided speed into fast or slow. These two groups were further sub-divided. Allegro assai was the fastest marking which he estimated at minim = 80. Adagio assai was the slowest at crotchet=40. These were the basic principles that governed tempi in the classical period. Daniel Turk (1756-1813) states that Allegro was considerably faster in the early 19th century than it had been 50 years earlier and the rule that speed was determined by the shortest note values was on the decline, though still applied as it was common for tempo to change within a movement. Beethoven is recorded as having conducted a performance of the Eroica lasting a full hour (presumably with repeats) - A performance in 1922 was listed as 52 mins and according to an article by F.Rothschild (1961) at 46mins.
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'Man know thyself'
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'Man know thyself'
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