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by ladelfa 1706 days ago
On the cello (and viola) three perfect 3:2 ("pythagorian") fifths down from the A string makes for a low C that's noticeably flat when compared to equal-tempered instruments. For string quartet playing, it's manageable, because the violins will adjust when necessary, but for piano-accompanied playing, cellists will raise the low C a little so it doesn't clash with the C's on the piano.