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It's worth noting that the Fugue in A minor, BWV Anh.103, was once attributed to Johann Sebastian Bach, but its authorship is now uncertain. Scholars believe it might have been composed by one of Bach's contemporaries or students.

Here are a few interesting facts about this piece:

1. Uncertain Authorship: As mentioned, the Fugue in A minor is one of the compositions with uncertain authorship in Bach's catalog. It was previously attributed to him, but scholars have cast doubt on this attribution.

2. Fugal Structure: Like many of Bach's works, this fugue follows a fugal structure. Fugues are characterized by a main theme (subject) that is introduced and then imitated by voices entering in succession.

3. BWV Anh. Catalog: The "BWV Anh." in the title stands for "Bach Werke Verzeichnis Anhang," which translates to "Bach Works Catalog Appendix." This catalog is used for compositions whose authorship is uncertain or doubtful.

4. Characteristics of A Minor: The key of A minor is known for its expressive and melancholic qualities. Bach frequently used this key in his compositions to evoke various emotions.

5. Legacy: Despite the uncertainty surrounding its authorship, the Fugue in A minor is still appreciated for its musical qualities. It serves as a reminder of the challenges in definitively attributing some Baroque compositions to specific composers.

Remember that information about BWV Anh.103 is subject to ongoing research and scholarship, and attributions may be revised as new evidence emerges.