There are some songs that are perfect. The perfection comes in the performance. No one needs to cover it ever since we have copies of the original. I am willing to say some like I Will Always Love You has two perfect versions, Dolly Parton and Whitney Houston versions. On Americas Got Talent a singer just covered it, I would have Xed him in ten seconds.
Other songs Somewhere Over The Rainbow sorry Judy Garland version is perfect. The very definition of a song that never ever should be covered.
Respect by Aretha Franklin perfect no need to cover it.
With A Little Help by Joe Cocker no one can sing it better.
Gloria by Laura Brannigan oh god this is perfection to listen to. One of my fav all time songs.
I think maybe a cover sometimes feels like they are meddling in my memories.