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With so many books and texts giving different values, how can I determine the BPMs of musical tempos? What about compositions that were written before the existence of metronome (so, the compositor
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Amazon.com: JOYO Digital Metronome Tone Generator 2 in 1 Rechargeable Electronic Metronome with 8 Vocal Modes and Large Display & Loud Speaker Beat for Guitar Violin Piano Music Instruments (Orange JM-92) : Musical Instruments
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