There are musicians with very unique voices and they are among my favorites. I listen to these three daily on my Pandora stations.
Leonard Cohen (1934-1916), Canadian, whispers into the microphone as though he is engaging in an intimate moment. His voice haunts and follows. You can hear his top 20 hits here on YouTube: https://www.youtube.com/watch?v=x1Cb4VjBKjc My favorite is “I’m Your Man.”
Your first guess must surely be Bob Dylan, the 77-year-old Nobel Prize winner for Literature (2016.) Dylan the anti-war, civil rights singer and songwriter growls all his music as an angry man. If you, like me, are a fan here’s his top 25: https://www.youtube.com/watch?v=wWQWh86sJsA
I invite you to describe the sound, the style of 85-year-old Willie Nelson. His voice is like none other and he has been writing music since he was seven years old. I’m not a big country music fan, but Willie is an exception for me. I love Willie! Hear his greatest hits here: https://www.youtube.com/watch?v=IzhW678PK4U&t=187s
“Music is the movement of sound to reach the soul for the education of its virtue.” Plato