Here's an easy one.

I've just finished listening to a budget Seraphim recording of Bach's
cantata "Wachet auf, rufft uns die stimme" BWV 140.  The fourth movement,
the chorale "Zion hort die Wachter singen", is set to very familiar music
that I know from some other Bach composition but can't quite place.  The CD
has no liner notes and a check of available sources (not to mention quickly
sampling a half dozen CDs) has been fruitless.  Help please!

Thanks in advance....

Tim Dickinson
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http://www.tdware.com/

 [You might want to check the Cantata Listener's Guide by Simon Crouch at
 Classical Net, linked from the Bach page, of course.  -Dave]