Johann Sebastian Bach wrote many chorale preludes. However, in the 1980s many unknown chorale preludes of Bach were found with the discovery of the so called Neumeister Sammlung. Bach clearly took his inspiritation from other contemporary composers he admired, such as Pachelbel, Buxtehude etc.
The nice thing is that you often can try different playing manners with the same piece. I play 'Wenn dich Unglück tut greifen an, BWV 1104' on one manual. It's also possible to divide the parts on two manuals and a pedal (a 2 clav. e pedale) or to play the cantus firmus in the pedal and the accompaniment on a manual.