Some instruments of about a century ago were built to be listened to while strolling, such as those at the Wanamaker department store in Philadelphia or the museum of San Francisco's Palace of the Legion of Honor, which is not heard to best advantage from any one spot.
There is now a regular season of organ recitals at the venue featuring famous classical organists from around the world.
As part of its season, some of these recital programs also include a silent film accompanied by the theater organ, to provide a complete experience the way it was originally intended.
A long list of accomplished organists regularly frequent the Plummer, including Chris Elliot and the inimitable Bob Ralston.
The annual conference and organ series attracted people from all over the world to Los Angeles and continued in the years following Mr. Swann's retirement as principal organist of the church.
The Los Angeles OLA Cathedral also holds weekly organ recitals on Wednesdays at 12:45 pm, following the noon mass.
A performance of the complete organ works of Johann Sebastian Bach was held on November 22, 2014, at St. Peter's Lutheran Church in Manhattan.