It’s kind of like a test drive. This week’s Pipedreams program is a review of a dozen recent compact discs, including one from an obscure - and ravishingly lovely - parish church in Waltershausen, Germany. We’ll visit Saint Mark’s Cathedral, Seattle, the old Paramount Theatre in Brooklyn, a lavish museum near Los Angeles, and Meyerson Symphony Center in Dallas, Texas. We’ll have music by Bach and his pupil Krebs, a French organ symphony rediscovered, and an introduction to the explosive improvisational talent of Wayne Marshall, who takes George Gershwin for a ride.