Flagey was the studio of the belgian radio, but now this building is use for music entertainment. The accoustic was really specific. You can change a lot the reverberation time by rotating some walls. Here the command pannel :
For this concert, the musicians has chosen with their knowlendge of the compositor to use a kind of cathedral reverberation.
Couple OCT :
Couple AB :
Couple XY :
Quatuor KryptosQuatuor à corde n°3 et n°5 de Giacinto Scelsi