Retiring Perfect Songs

There are some songs which have just been sung so brilliantly that they should be retired because nobody is ever going to sing them better so they should be off limits because anybody else is just going to fail to do it justice.
In this list i would include Whitneys 'I Will ALways Love You',  Loren Allred's 'Never Enough, Lea Michele's 'O Holy Night', 'California Dreaming' by the Mamas and Papa's, 'Ace of Spades' from Motorhead and 'Only You by 'The Platters' but there are some famous songs which could be huge and are yearning to be included, it's just that i have never heard the definitive, perfect version of them.
'Hallelujah', 'Will You', 'Smile' and 'The Impossible Dream' are some songs just waiting for someone to pick them up and belt them out to do them justice and there have been some good versions, but not THE perfect versions although Jennifer Hudson came mightily close with her Impossible Dream but i could not find a studio version, just singing live but she was mightily impressive.
Hopefully she will put it on an album one day then i can tick it off my list.