"Wachet Auf" (also known as "Sleepers Awake") is a chorale cantata by J. S. Bach. For a splendid wealth of details about this great cantata, read here:
https://en.wikipedia.org/wiki/Wachet_auf,_ruft_uns_die_Stimme,_BWV_140
The words are magnificent, but it's the tune I find especially nourishing. There are several marvelous piano transcriptions of the main tune. Wilhelm Kempff recorded his own (see Amazon.com) and there's another by Busoni that many pianists have recorded, which I also like and sometimes play at weddings.
https://en.wikipedia.org/wiki/Wachet_auf,_ruft_uns_die_Stimme,_BWV_140
The words are magnificent, but it's the tune I find especially nourishing. There are several marvelous piano transcriptions of the main tune. Wilhelm Kempff recorded his own (see Amazon.com) and there's another by Busoni that many pianists have recorded, which I also like and sometimes play at weddings.