Johann Sebastian Bach's stature as a composer of such extraordinary genius and widespread influence is so firmly established in Western culture that it is difficult to imagine that only a little over a century-and-a-half ago, his music and reputation languished in obscurity, virtually unknown to all but a few specialists. It was through Mendelssohn's recognition of Bach's genius and his efforts in making Bach's works accessible to a wider public that these works are today recognized as summits of musical expression.