My son sings in a men’s choir; has for years. One day I asked him who the greatest male vocalist was and he immediately responded that it was Sinatra.
He pointed out that his pitch is perfect; every note is spot-on. He told me to listen to the details of his singing. I have, and enjoy him even more.
Smart kid! He’s right. Every note is just pure. To me it’s the smoothness of the transitions between notes that makes him the best. It’s just silky. Not to mention great songwriting and lyrics. Just the epitome of cool.