There is no final stage in nirvana. Nirvana is beyond definition. It is not quantifiable.
I would never try and play like Harry James, because I don't like his tone - for me. It's just white. You know what I mean? He has what we black trumpet players call a white sound. But it's for white music. . . I can tell a white trumpet player, just listening to a record. There'll be something he'll do that'll let me know that he's white.