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However, it's worth noting that "Fugue in F-sharp major, BWV Anh.97" is often attributed to Johann Sebastian Bach, but there's some uncertainty about its authorship. The BWV Anh. (Bach Werke Verzeichnis Anhang) designation is given to works whose attribution to Bach is questionable.

Now, for interesting facts:

1. Authorship Dispute: As mentioned, the true authorship of BWV Anh.97 is uncertain. Some scholars believe it might be the work of Carl Philipp Emanuel Bach, Johann Sebastian's son, or another composer from the Bach family.

2. Fugal Structure: The piece is a fugue, a musical form characterized by its contrapuntal texture and imitative passages. In a fugue, a musical theme (subject) is introduced and then imitated by voices entering in succession.

3. F-sharp Major: The key of F-sharp major is relatively uncommon in the Baroque period. Composers often favored more common keys like C, D, or G major. The use of F-sharp major adds a distinctive and somewhat rare flavor to the composition.

4. Counterpoint Mastery: Bach was a master of counterpoint, and his fugues showcase this skill. Counterpoint involves combining different melodic lines in a way that is harmonically interesting and structurally intricate.

5. Pedagogical Purpose: Many of Bach's fugues, including those of disputed authorship, were likely composed for educational purposes. They served as examples for students to study and master the principles of counterpoint and fugue.

6. BWV Anh. Catalog: The Anhang catalog includes compositions that are either of doubtful authenticity or have uncertain origins. Scholars continue to research and debate the authorship of these works.

In summary, while the specific details of BWV Anh.97 are somewhat elusive due to its disputed authorship, it remains an intriguing piece within the context of Bach's musical legacy and the Baroque period.