It is called a metronome.
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In music notation, a crotchet (quarter note) is typically equal to one quarter of the duration of a semibreve (whole note). Therefore, there are typically four crotchets in a semibreve. This relationship is based on the standard time signature of 4/4, where a semibreve receives four beats and each crotchet receives one beat.
It will probably take 7 years to become a music teacher.
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