When the great voices crack.

[Bitmap Frogs]

I recently had a friend (who also enjoys with gleeful delight the spectacular cracks some singers have graced the theatres with) point to me this video of spanish tenor José Carreras performing one of the most scandalous cracks I've ever heard. There's some dispute however wether the audio track has been tampered with and i'd request from the community if anyone could shed some light into the issue. Hereby embedded is the YT video.