It is hard to imagine that even a composer as great as J.S. Bach endured decades of obscurity after his death in 1750. It was none other than Felix Mendelssohn who revived Bach’s legacy. In 1829, he conducted the first public performance of the St. Matthew Passion, almost a century after its 1727 Good Friday premiere at Leipzig’s St. Thomas Church. Bach, and his work, became “overnight” sensations and the rest, as they say, was history. Not only does the Toronto Mendelssohn Choir have a special connection to the work’s late-found fame through its namesake composer, it was also the…