The slide show is a recording of Prelude & Fugue in D Major Op. 28 from Five Preludes & Fugues for Organ Op. 24-28 by Steven Monrotus.
Dedicated to pianist/organist/accordionist
Robert Thompson, this work is a 6-part prelude based upon the methods that Louis Vierne employed to improvise on a single free theme paired with a related 4-voice fugue having three countersubjects and written in quadruple counterpoint.
The audio clip is computer generated and merely provides an idea of what this music might sound like on the real McCoy.