What is the name of the choirmaster in The Mystery of Edwin Drood?

The choirmaster in The Mystery of Edwin Drood is John Jasper. He is the choirmaster and precentor of Cloisterham Cathedral, as well as Edwin Drood's uncle and guardian.

Jasper is one of Dickens's most psychologically unsettling characters. He teaches music to Rosa Bud, Edwin's fiancée, and secretly desires her. He also visits an opium den in London, where his drug-induced speech hints at obsessions and possible crimes. His interest in the cathedral crypt adds to the novel's Gothic atmosphere.

When Edwin disappears after a stormy Christmas Eve, suspicion falls on Neville Landless, Edwin's rival for Rosa's affection. Jasper helps encourage that suspicion. Dickens's surviving plot hints, along with comments reported by his friend John Forster, strongly suggest that Jasper was intended to be the murderer, although Dickens died before completing the novel.

The Mystery of Edwin Drood was published in six planned installments during 1870, but only six of twelve intended installments were written. The book therefore has no definitive ending. Mr. Crisparkle is instead a minor canon, while Neville Landless is a suspected rival—not the cathedral choirmaster.