This documentary film traces Opera Fuoco’s rendition of Bach’s B-minor Mass at the closing concert of the 2019 Bachfest in Leipzig‘s St Thomas church, in a performance that most closely followed the orchestral/choral placement used by the composer during his time as cantor there. Interviews by leading Bach scholars and performers raise essential questions about the importance and understanding of text and explore thoughts about the historical vs contemporary use of a boys choir and the rigors and rewards of such an interpretation.