What better way to ring out 2020 and ring in a new year than with Sarah Cahill, a renowned pianist and advocate for new music? On Saturday, December 5, Sarah will join us via Zoom to talk about her multifaceted musical life, which spans performing, commissioning and premiering new works, writing about music, and hosting “Revolutions Per Minute,” a long-running radio program on KALW-FM in Berkeley. We chatted with Sarah via email, eager to learn more about her influences, her…