Bach Cantata 140

This essay need to introduce the background of BWV140 and analysis the BWV140. And also need to describe how feel about this BWV140.
Please use very basic words and simple grammar to complete it. This essay is the small report after the performance of BWV140.
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The BWV140 was called the “ Wachet auf, ruft uns”, that means “Awake, calls the voice to us”. He composed the choral catata in the Leipzig for the 27th Sunday after Trinity and first performed it on 25 November 1731. It composed by Johann Sebastian Bach………
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Ps: I don’t have attachment. you can search on the line. Here has a BWV140 full music score.