Take a great, old sing, add a baseline and let some female sing over it.
Latest example: Wu-Tang Clan & Erykah Badu: The Heart Gently Weeps (YouTube)
Don’t get me wrong. I like Wu-Tang Clan and I love Erykah Badu. But with that song, they sell themselves under their value.
The original is „While My Guitar Gently Weeps”, written by George Harrison for The Beatles („The White Album”). Eric Clapton played lead guitar on the album version of the song with a Gibson Les Paul guitar.