This is the 1956 Mercury Living Presence LP "Bach on the Biggest", performed by Robert Elmore on Boardwalk Hall's Midmer-Losh pipe organ-the largest and loudest musical instrument ever created. AFAIK, this is the only commercial recording of this instrument made when it was anywhere near fully operational (currently, it's around 30% playable after 12 years of restoration work). Even though this is a single-mic recording, you can really hear (and feel!) the sheer massive power of this thing. It's my go-to test record for my sound system.
Side 1
0:00 Toccata in D minor, BWV 565
2:35 Fugue in D minor, BWV 565
8:00 Wachet Auf, BWV 140
12:10 In Dulci Jubilo, BWV 608
Side 2
14:30 Toccata in C major, BWV 564
20:45 Adagio in C major, BWV 564
26:25 Fugue in C major, BWV 564