00K6700.000 SPHERES. There are two rolls of alternate Bach selections that McLaren tried and rejected. They should be kept as they will be historically interesting for researchers etc. Roll One: Fugue #24; Prelude #20; Fugue #20 (alternate for third part). Roll Two: Fugue #24; Prelude #20; Fugue #14 (used in final version). The mags are in sync with material in FI12821.000.