I just started listening to it, and I definitely think the off tune is intentional, as it is off-tune the same way every time, and no one who plays an instrument has that bad hearing to know that it's off (let alone 6 people who make up the band), I play violin and this is seriously EXTREMELY off the beaten path, but I can't stop listening to it, morbid fascination is an excellent way to describe it.
Paladin777-out