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"Wachet auf, ruft uns die Stimme" (Awake, the voice calls to us), BWV 645, is a famous chorale prelude composed by Johann Sebastian Bach. Here are some interesting facts about this piece:

1. Original Source:

   • It is part of a larger collection known as the Schübler Chorales. These were published around 1748 and are named after the engraver and publisher, Johann Georg Schübler.

2. Chorale Text:

   • The music is based on the hymn "Wachet auf, ruft uns die Stimme" by Philipp Nicolai. The hymn is often associated with the Parable of the Ten Virgins from the Gospel of Matthew.

3. Chorale Prelude:

   • As a chorale prelude, BWV 645 follows a traditional structure where the melody of the chorale is presented with elaborate accompaniment. Bach's treatment of the chorale demonstrates his mastery in combining technical complexity with expressive depth.

4. Triple Meter:

   • The piece is in triple meter (3/4 time), providing a distinctive rhythmic character. The triple meter contributes to the dance-like quality of the prelude.

5. Symbolism in Music:

   • Bach often incorporated symbolic elements into his compositions. In this chorale prelude, the triple meter is thought to symbolize the Holy Trinity, adding a layer of theological meaning to the music.

6. Instrumentation:

   • While originally written for the organ, "Wachet auf, ruft uns die Stimme" has been transcribed for various instruments and ensembles, showcasing its adaptability and enduring popularity.

7. Influence on Later Composers:

   • The beauty and emotional depth of Bach's chorale preludes have inspired numerous composers across centuries. The introspective nature of BWV 645 has left a lasting impact on the organ repertoire.

8. Bach's Legacy:

   • Johann Sebastian Bach is considered one of the greatest composers in the Baroque era, and his contributions to Western classical music continue to be studied and celebrated. "Wachet auf, ruft uns die Stimme" remains a testament to his compositional genius.