Very good use of choir for simply testing it out. The only discrepancy was between 0:18 and 0:26. But that wasn't of the choir itself. They just sound slightly off key.
This sounds like a church choir begrudgingly owed a favor to a rockband, and was forced to rock out with them.
10/10 because you seemed to hit the mark you were aiming for.
thank you. the dissonance is on a person to person basis, as with any dissonant chord. it just depends on what kind of music you listen to, i suppose (though it's an awfully high note, eh?).
the choir owed some back-rent to the drummer.