Room 4-160: Harry prepares the opening act to a Weird Sisters concert. Building 4 practice rooms are accessible only to performance ensembles members, but three piano rooms in W20 are free to the entire MIT community. Andrew Swayze —The Tech May. 9, 2016 Facebook Twitter Reddit Print Room 4-160: Harry prepares the opening act to a Weird Sisters concert. Building 4 practice rooms are accessible only to performance ensembles members, but three piano rooms in W20 are free to the entire MIT community. Andrew Swayze —The Tech