Sacred songs

I dont mean religiously or spiritually, but songs that should be left alone, left with the original artist.
I know this is all opinion, but most if these posts here are. I often hear covers of songs and some work, some they get away with, just, and others are train wrecks. There is one song in my view that is sacred to me and I cringe whenever I hear the piano intro by any other artist, because I know it will fail.

Bridge Over Troubled Waters.

Interested to hear others.