There are three for profit organizations that rent the Cathedral after it closes at 7 pm. The Cathedral is swept of visitors and closed. Then it opens in about ten minutes for ticket holders only.
All the concerts revolve around the magnificent organ and the splendid acoustics. There is no reverb- just clean music.A higher price gets you a thicker pad on your chair but no appreciable acoustic plus.
It is worth going to any concert just to hear the Bach Toccata and Fugue in D Minor done full throttle in a large, good acoustic setting.
Among the cons is the length of the concerts. Ours was to be 60 minutes but that apparently includes the ten minutes to seat the listeners. The cellist and the organist had iinsufficient practice together and that was painfully evident in phrasing and volume. We were hustled out of the Cathedral after 40 minutes of music including one encore.
Note! There is no easy handicapped access to the concert. You have to climb the stairs-in spots without a handrail. No wheelchair ramps.