Shiz - this is easy.

Ray Charles
Aretha Franklin
Frank Sinatra
Tony Bennett
Ed Trickett
Carmen McRae
Ella Fitzgerald
Richard Hidalgo
Roy Orbison
Tony Williams of the Platters
Lyle Lovett
Teddy Thompson
Bob Shane
Joan Baez
Waylon Jennings
Marty Robbins
Emmy Lou Harris
Patty Lovelace
Herb Pedersen
Gordon Lightfoot