Mr. Tepfer, 38, who also excels in classical music and has an undergraduate degree in astrophysics as well as sophisticated technology skills, wrote a computer

Mr. Tepfer, 38, who also excels in classical music and has an undergraduate degree in astrophysics as well as sophisticated technology skills, wrote a computer program. He recorded himself playing Bach’s “Goldberg” Variations, beautifully, on a Yamaha Disklavier, a full grand piano with a high-tech player piano function; his program then played back each variation, but flipped. ... The results, Mr. Tepfer writes on his website, are like looking at Bach “through a prism”; the music “feels like a new piece.”