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Johann Sebastian Bach's "Auf, schmetternde Töne der muntern Trompeten, BWV 207a" is a secular cantata composed by Bach for the celebration of the Leipzig University's 200th anniversary in 1723. Here are some interesting facts about this composition:

1. Occasion: The cantata was written for the bicentennial celebration of Leipzig University and was first performed on February 5, 1723.

2. Instrumentation: It is scored for four vocal soloists (soprano, alto, tenor, and bass), mixed choir, and a Baroque orchestra that includes trumpets, timpani, strings, and continuo.

3. Structure: The composition consists of nine movements, including recitatives, arias, and choruses. Each movement showcases Bach's masterful use of counterpoint and intricate musical details.

4. Text Sources: The text for "Auf, schmetternde Töne" was likely written by Bach's regular collaborator, Christian Friedrich Henrici, who wrote under the pen name Picander. The text reflects on the university's history, achievements, and the importance of music in celebrating such occasions.

5. Secular Nature: Unlike many of Bach's cantatas, which are primarily religious, this work is secular in nature, celebrating a significant academic event.

6. Musical Elements: The cantata features lively and celebratory sections, especially in the choruses, where the trumpets play a prominent role. Bach's skillful use of harmony and counterpoint is evident throughout the composition.

7. Reconstruction: Despite its historical significance, the original score of BWV 207a is incomplete. Modern performances often involve reconstructions of missing parts to present a more complete rendition of the work.

"Auf, schmetternde Töne der muntern Trompeten" showcases Bach's ability to compose music that is both festive and intellectually engaging, fitting for a celebration of academic achievement.