Piano four hands in A♭ major

The task

Compose a piano duet for four hands in Ab major, 130 BPM moderato, 4/4, about 80 bars and about three minutes, scored for piano four hands in 4 voices. Texture: the upper pair leading and the lower accompanying, swapping at each section. Open with 4 bars of piano four hands alone, then layer the other parts in one at…