Hey Destiny! The other keys part is very sporadic in this song. There are long gaps with a few notes sprinkled here and there, so it doesn't really lend itself to this type of tutorial. Are you familiar with the blues scale? A lot of the lines the pianist plays are from the C blues scale: C Eb F F# G Bb C. If you play around with those notes while listening to the recording it will sound really cool. That's what the keys player is doing a lot of the time. Hope that helps!
