Vocals without music that stand the test of time

THis wrecked me his voice is out of this world just hear it 

Sean Paul get busy hear from 0:00 to end of song his voice is amazing I get excited from 0:09 mark super hard such voice oh my god

Korn Jonathan has an amazing voice in freak on a leash 1:21 mark

Krazy Bone - Heated heavy 0:28 mark awesome

Disturbed 0:53 mark His vocals without music is like fine wine , Disturbed - Liberate. 0:53 mark make me cry

Probably need to give a shout out to Elvis and Sinatra.

It may be “old” but there is a reason people still know their names…

Gonna cheat alittle bit this is an example of very bad acapella voice only without music, I know the thread is about apreciation but I'm only gonna do this to show which I should of done on my OP but haven't don't takeit as appreciation moreso an example of bad singing.