Each part requires a different lever harp tuning:
Harp 1: one flat, key of F, E sharp and A sharp levers up
Harp 2: two flats, key of B-flat, D sharp and A sharp levers up
Harp 3: no flats, key of C, B sharp and E sharp levers up
There are no lever changes for Harps 1 and 2, once the levers are set. In Harp 3 there is one lever change: F sharp in measure 52 to F natural in measure 72. This is a fun piece for pedal harps, too.