Bach - Credo - FC17 ALRY Publications Sale! from $20.00 Choose format: Printed Book Only Printed book and PDF via Email INSTANT PDF Qty. Add to Cart SKU: FC17 from the Mass in B Minor. Instrumentation: 6 Flutes Alto Flute (or Flute 7) Bass Flute (or Flute 8) E-flat Flute (optional, in lieu of Flute 1)