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Apple’s Tribute To Steve Jobs, Yo-Yo Ma, And The Prelude From Bach:

As it turns out, Ma plays the first four Bach suites tuning down his cello a full semitone, and there is a specific reason for doing so. In baroque times, instruments like cellos sounded a little different: the musical note A (A440) didn’t have a frequency of 440 Hz, but was more around 415 Hz — something known as the baroque pitch.