Fugue
Bach: WTC, vol. 1, Fugue No. 16
Exposition I,
order of entry: A-S-B-T, episode seperates entries into two pairs
later expositions:
no standard arrangement of subject and answer version No fixed number of entries Sometimes entire theme is not stated, final or first note are diverted
Fugue
Subject with the 7th scale degree
Bach WTC, Fugue in A Subject: Answer: 5. Transposed up a fifth, a 7 in the subject need not answered by 4-a fifth above-but by 3.
1. 3.
Contrapuntal devices in fugue
Fugal procedure
Augmentation, diminution, inversion,
retrograde Stretto 提前進入
Stretto may occur at any time in the course of the fugue.
Fugue
Subject and Answer
Two types of imitation: real; tonal
Handel Messiah, Part II Subject: (5-1, 3-6, 1-4) Answer: (1-5, 7as it enters, each voice sounds either 1 or 5 of the main tonality 2. The answering voice transposes the subject up a perfect fifth or down a perfect fourth