This "jam session" is a C7 chord played over and over for you to get down all funky and play some blues.
"Stab" away with the left hand chord only
in time with the music.
Add F, Ab, Bb & B (natural)
in the right hand.
Tip: Always play an Bb after the B.
Play any notes from the blues scale.
Tip: Always play an Bb or C after the B.