Many of Joyce Hatto’s recordings were copied from other pianists’ discs. “As it happens, questions about the authenticity of Ms. Hatto’s recordings had for some time been aired in Web chat by music lovers who asked how it was possible for an aged and ailing woman to record so much. They also pointed out that most of Ms. Hatto’s more than 100 CDs were issued over the last 10 years and a number since her death.”