The London Bach Society was started in 1946 by Paul Steinitz because he wanted to perform Bach in a style which was like the way it sounded in Bach's time. Bach lived from 1685 to 1750. By the 20th century a lot of things had changed in music. Choirs and orchestras were much bigger and instruments were made differently. Steinitz wanted to get back to the sort of sound that Bach would have known. He started a choir called the London Bach Society so that they could give concerts of Bach's music, making it sound much clearer than it did with huge, romantic choirs.