Kate Bush with Wow. Album Lionheart (1978).
What a voice! Her soprano is described as encompassing between 3.17 and 4 octaves. Respectable, but still way less than the record holder, who seems to be Axl Rose. As for the lyrics in this song, I never knew what the vaseline was for, until I found out it's got something to do with sex (yeah I'm a genius), and indeed, in the original video at about the 2:19 mark she's patting her behind. Wow. I'd never have guessed that from Kate.
Moby with Slipping Away. Album Hotel (2005).
If you ever wondered why he's called Moby, his real name is Richard Melville Hall, and Herman Melville, author of Moby-Dick, is his great-great-great-grand uncle. Maybe Ole Herman had a premonition that little Richard would turn out to be a dick.