This paper will introduce you to two very different multipurpose halls planned in two new buildings in Oslo; The new main library (the Deichman library) drawn by Lund Hagem architects and the new museum for the Norwegian painter Edvard Munch drawn by estudio Herreros architects, both planned to be opened in 2019. The two buildings are located close together and will be significant contributions to a new cultural centre near the Oslo opera house (opened 2008). The capacity of the minor hall is about 200 seats, whereas the larger hall has about 277 to 380 seats, depending on the seating arrangement. The Odeon models used for the acoustic design of the halls will be presented and discussed. The calculation results and the geometry of the halls will be presented in context with the Norwegian standard NS 8178 “Acoustic criteria for rooms and spaces for music rehearsal and performance”.