This "jam session" is a Bb7 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 Bb, Db, Eb & E (natural)
in the right hand.
Tip: Always play an Eb after the E.
Play any notes from the blues scale.
Tip: Always play an Eb or F after the E.