I think the good Captain is experiencing caffeine withdrawl.
Virtually EVERY performance of classical music is in essence a cover, as most of the composers are dead and gone and virtually NONE of the original performances exist in recorded form.
That being said -- yes, the Heavenly cover is particularly bad. But there are MANY modern recordings and re-envisioning of classical pieces (generally, any piece written prior to the Industrial Revolution) that are flat-out G R E A T.