One of my cousin's songs. We played keyboards about the same -- poorly -- but the way the recording process usually shook out, the duty largely fell to me. I had a secret advantage, though.
In my misbegotten youth, I wasted a couple of years learning the accordion, so the right hand fingering was natural to me (the left hand, not so much). It might also explain the occasional "Lady of Spain" and "Beer-Barrel Polka" riffs that crept into my efforts.