It looks like it has a 64' pipe labeled "Gravissima". I know only how pipe organs work mechanically, not the terminology (Google translate thought Gravissima was Italian—translated to "Very Serious" in English, ha ha).

Those low frequencies though are the draw for me.

The lowest frequency I have come across in pop music might be the backing organ from the song "Prologue" on ELO's album Time. I had the vinyl in the day… One wonders: even with RIAA bass compensation, I suspect it might have been close to jumping the needle out of the groove.