Answer: B

Option A, fugue is a polyphonic music genre popular in the Baroque period. The structure of fugue is standardized. At the beginning of the music, it is in monophonic form. The main musical material that runs through the whole song is called the "theme", and the counterpoint relationship with the theme is called the "antithesis". After that, the theme and the antithesis can appear in turns in different parts, and there are often transitions between themes. Use sexual phrases as musical contrast; option B. Prelude is a type of music genre. The prelude used to be just an instrumental introduction before the suite. Before the performance, the performer generally had to improvise a short section, which gradually evolved into an art form. Option C, the motet was a musical instrument in the European Middle Ages and Renaissance. Sing polyphonic chorus songs that explain the Bible, unaccompanied polyphonic chorus songs, in which Latin lyrics are sung in a fixed tune, and other parts do not sing lyrics like the current vocal training songs; Option D, creative songs are based on imitation The name of the genre of mainly polyphonic music is a piano ditty with a polyphonic structure, which is improvised based on a certain musical motive, similar to a minor fugue.