Pianist Sarah Cahill appears at LPR on April 6th at 7 PM as part of her tour celebrating the music and birth centenary of composer Lou Harrison. She and I touched base earlier this week as she was preparing for her trip to the Northeast.   Hi Sarah. Thanks for taking time to talk with Sequenza 21. Which was the first Lou Harrison piece you played? When were you first aware of his music?   I don’t remember the first piece I played, but I became interested in him because of my fascination with Henry Cowell and Ruth Crawford and