EDIT: This is a RE-submission of the Scherzo, as the tail end of the original audio file was truncated one second too early. My apologies to Jim (virtualpoguy62) whose very positive comment had to be deleted to make way for the second upload of the same audio.
The performer's own adaptation to organ of Rachmaninov's transcription for piano.
The audio is post-processed with additional plug-in reverb from Acon Digital Verberate. I have no affiliation with the Acon company.