Switch to Sam.
Talk to Charlie about Junior, change the music to the one about tablets (I forget exact title something about 2 tablets for 1). This turns the statues tablet into a ladder like ribcage.
Click the piano to change music again and put on the one about a face (darkest face or sumat like tht) this makes the Sam clones go in the right side, near the tablet. Walk Max into tht line of clones so he gets hit up in the air and lands on the ribcage.
Change the music to crown of flames to reproduce the tentacles. In max mode over the statues shoudler hit the "swing on tentacle" option