Curtains have been added in numerous places in Helzberg Hall. Was this temporary for ABBA or a more permanent attempt to temper the brightness of sound which the hard walls and floors produce?

Recently went to Sinatra and friends show. The curtains were there also and the acoustics were spot on.

Draped areas, speakers and lighting will vary with each show.

They are temporary and are put in when shows use lots of amplification to cut down on the loudness, such as pop bands, films with love orchestra, etc.