He switches it up. Last night, he played no instrument except harmonica for 4 or 5 songs. Played Guitar on about 4 others. Organ on the balance.
I saw James Brown a number of times and on the final tour he had the smallest band I’d ever seen him with. There was no one on keyboards except for James. He even played a tribute to Ray Charles who’d died that year.
Also I never saw him leave the stage or even take a sip of water.