He composed organ works for secular use, such as Introduction, Passacaglia and Fugue, Op. A massive, dissonant fugue forms the finale of his String Quartet, Op. Her classes included music history, harmony, counterpoint, fugue, orchestration and composition. Dissociation includes depersonalisation disorder, dissociative amnesia, dissociative fugue, dissociative identity disorder, etc. A homophonic section is followed by a fugue. There he received detailed training in the arts of fugue and counterpoint. The vast movement has aspects of both a fugue and a ritornello movement. Each Prelude is followed by a Fugue in the same key. The Henry Purcell's theme is triumphantly cited at the end making it a choral fugue. Each set contains twenty-four pairs of prelude and fugue. A silence, and then a fragmentary burst of the opening of the first fugue. An unfinished sequel on Canon and Fugue was published posthumously. Similarly, a triple fugue has three subjects. Many of his works employ the genres of canon and fugue. A double fugue has two subjects that are often developed simultaneously.