 It contains four manuals and 57 ranks that include theater stops which make it a rarity in the Archdiocese of Chicago.The cost of overhauling the organ in 1962 amounted to $15,000.In 1973, extensive repairs were made on the exterior of the dome of St. Mary of the Angels Church and the Holy Name Society donated the blue "Guiding Light", which is visible in the cupola for a significant distance—especially from the nearby Kennedy Expressway.