. I think there has to be a certain strength in the breath support and a declamatory voice. I don't think that the aspirate (dare I say it..whining) of the young pop singers fit the style. I think that it is necessary to know about the song, where it came from and why it needs to be sung. There is an urgency in the singing that compels the audience to listen. I think it's not about the voice by itself or perhaps the musicality of the song but more about what the lyrics convey. An emphasis on the art song approach which would be the expression of the composer through using the voice as a musical instrument sometimes making the words subservient is not in the style of the trad singer. This would be true of the jazz singer as well. Frank Sinatra's criticism of Ella Fitzgerald comes to mind. He thought the lyric was subservient to the "scat" singing technique.