The problem with this post is that it is too broad. Like what's the best book of the 20th century. Classical and operatic singers have a decibel level due to singing without mikes that no popular singer can match. That said my vote goes to Sinatra (his phrasing and way with a lyric was far more impressive than his voice) in the pop realm. In the classical world, Jussi Bjoerling, no contest! Voice rang like a silver bell, had enough growl to do verismo opera, understood phrasing and language like no other. If you want proof get hold of the Seraphim copy of Pagliacci (with Warren, De Los Angeles and the young Robert Merrill) in mono.
