" ICH RUF ZU DIR, HERR JESU CHRIST - When you play this, it is very musical (the most musical I've ever heard) but I've heard this played very mechanical in most recordings. How do you know when to speed up and slow down in this piece (or any other Bach piece) to make it musical? Is there a formula? I love this new series of yours (except sometimes it's difficult to hear you in the car). Thank you for all your help! You two are inspiring!"
What Paul is referring to here is agogic. It's the principle that let's you to fluctuate the tempo very gently. Basically, we slow down when something new or interesting is happening - key change, new section, new theme etc. Then we can pick up the tempo slightly.
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Vidas and Ausra
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