sentences:  Under new ownership, the Orpheum became the home of the newly formed Louisiana Philharmonic Orchestra (LPO), whose musicians prized the auditorium for its acoustical purity.The theater is an example of "vertical hall" construction, initially built to provide perfect sight lines and acoustics for vaudeville shows which didn't have the benefit of amplifiers or modern lighting.The Orpheum Theater was listed on the National Register of Historic Places in 1982.