You may think you know Hamilton, but we have a surprise for you: Tony winner Renée Elise Goldsberry and King Rorge (a.k.a. Rory O'Malley) shared a cut song at #Ham4Ham on August 31, which was also the last day of the incredibly popular Hamilton pre-show entertainment. Goldsberry sang, "Congratulations," which ended up not getting its shot in the final Broadway production. Take a listen below and feel like you learned something new about Lin-Manuel Miranda's mega-hit musical! Happy trails, #Ham4Ham. We're gonna miss you!