Especially for organ hall, masters of "Rieger-Kloss"Company (Krnov city, Czechoslovakia) constructed a big concert organ.
     They tried to approximate its look to architecture of a church and that united a unique architecture with a unique instrument. Organ has 55 registers that are distributed to three manual and one pedal keyboards; 3945 pipes of different size (from 13 millimetres to 6 metres high), made of iron and valuable races of tree (ebony and mahogany). Programme control makes possible to use the entire timbre palette in full. A big variety of facilities of this organ favour to performing music of different styles and kinds, including works of modern composers.