Bach's "St. John's Passion"
If you went to the Good Friday Vespers service at St. Nicholas Church in Leipzig 300 years ago, the choir, led by your cantor J. S. Bach, would have performed a little number, the St. John Passion, that would have doubtless moved you greatly as a meditation on the atoning death of Jesus Christ. An account of a performance and its meaning.
Source: patheos.com