The changes
The hands
Left hand then right, as the source writes them. A pianist's voicing routinely carries a colour the chord symbol does not spell — a flat ninth over a dominant, a ninth on top of a seventh chord — so the notes printed under each keyboard are what is actually played, rather than what the symbol alone would predict.
Dm9
chord 1
LH D3 A3RH F4 C5 E5
G13
chord 2
LH G2 D3RH E4 A4 B4 F5
Cmaj9
chord 3
LH C2 G2RH E4 B4 D5 G5
Let ring with sustain pedal