Having a key center means holding a note in your mind even once you stop playing it. As harmony revolves around that note, you may wonder if this is an Fm7 or an A minor. Or is this an A augmented or an A? Is it a B flat or a C? Ultimately, music theory is about finding the most compelling argument from what you’re hearing and what you’re feeling, and sometimes all the answers are correct. You can show that with someone who belongs in a beat-kidging class.
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