I have a piece to read that gives the tempo of dotted quarter = 144. Does that mean it's at a quarter note = 96? The piece has a time signature of 12/8, and I'm guessing each eighth note is played at a rate of 96 bpm. Is this right?
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Could you tell me the song you are having trouble with?– TooCleverFoxNov 8, 2018 at 17:29
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1 Answer
If the dotted quarter is played at 144bpm, that means that 144 of them will fit in a span of one minute. Since there are three eighth notes in a dotted quarter, then there are 144 * 3 = 432 eighth notes that will fit in this same span. And since two eighth notes fit into a quarter note, there are 432 / 2 = 216 quarter notes that fit into this span.
As such, the quarter note tempo would be 216bpm.
A simpler way of finding this tempo would be acknowledging that, since there are three eighth notes in a quarter note, a quarter is 2/3 of a dotted quarter. So we divide 144 by 2/3, which is the same as multiplying by 3/2.
With that said, if the piece is in 12/8, only in rare very circumstances would you use a quarter-note pulse to help you understand the piece. Since the main "beats" of 12/8 are marked in dotted-quarter notes, I strongly recommend sticking with the dotted quarter = 144 recommendation.
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3to add to the last sentence. keep the metronome at 144 and count to 4 and give it a triplet feel. 1xx2xx3xx4xx or you could count to 12 but the metronome would fall on the bold beats: 1 2 3 4 5 6 7 8 9 10 11 12, if that was not clear– b3koNov 8, 2018 at 17:51
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@Richard does that mean that if the signature is 12/8, the eighth note gets the beat, and each beat is played at 216 bpm? Nov 9, 2018 at 18:06
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@JerfyDerpy In 12/8, the dotted-quarter note gets the beat, and each beat is played at 144.– RichardNov 9, 2018 at 18:07