What preceded surround sound? Well, as far as music goes, people basically stood on all sides of you and sang. At least, that is sort of what composer Thomas Tallis tried to accomplish back in 1570, when he composed “Spem in alium” for a 40-person chorus that would form a horseshoe around its audience. 90.5 WUOL and the Louisville Chamber Choir are bringing Tallis’ work to the 21st century with actual surround-sound technology. Visitors can experience the production and 360-degree video in the main floor video gallery of the 21c Museum. An introduction and discussion will be led by UofL Director of Liberal Studies John Hale at 8 p.m. Light refreshments and a cash bar will be available.