As the son of a musician, and someone who briefly tried to study at music school I can confirm that what Third says about the Bach stuff is very real.
This is admittedly one of my early bugbears on bullying Corpse, but a lot of people who accept something is very good and established as quality because enough people have proven and demonstrated it. Here's a personal anecdote:
I don't like A Love Supreme. It's a fine album but I don't like it all that much. Give me Interstellar Space or Ascension (which I heard first from Coltrane) any day instead. Now that's a personal choice by circumstance which is uncommon, I recognize that. But enough people have made A Love Supreme the canonical Value Over All The Coltrane and a good majority of Jazz. Devotees of this album get into a bizarre phenomenon of reverence and exhibit "Trane Face". They sit down, hands folded and stare forward in a severity and seriousness, they observe as a ritual. This is a man who is communicating from nirvana. This is not a man in their minds, as Miles Davis once remembered, who "picked his boogers on stage instead of playing sometimes". It becomes something ghastly that I'm sure Coltrane would've balked at in that he became Powerful and a symbolic moment, weaponized for the purposes of intellect.
Likewise, Bach has similar totemic value for people as 'intellectual' music which we know to be bunk and yet still frequently becomes a transmission of concepts and perceptions not from the time, but Mounted Onto It.