His American achievements included a 1904 series of no fewer than 40 recitals on the largest organ in the world, the St. Louis Exposition Organ, now preserved as the nucleus of Philadelphia's Wanamaker Organ.
Dupré's "Symphonie-Passion" began as an improvisation on Philadelphia's Wanamaker Organ.
The largest example is the Wanamaker Organ, installed in 1911 after having been exhibited at the St. Louis World's Fair.
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Keith Chapman, composer, organist at the Wanamaker Organ