Is it a dying art form?
Here’s cowboy singer Don Edwards…
Maybe you have to be named Don to be a really good yodel-man? Here’s Don Walser. Let me say here that if it weren’t for my buddy East Texas Red I might not know about either of these guys.
Jimmie isn’t a bad name for a yodel-man either…
And let’s not forget Yodelling Slim Clark. Wow!
27th Street 
I guess that I owe a vote of thanks to East Texas Red, too. As for the question with which you lead off this entry–“Is it a dying art form?”–could you rephrase that? There is no way that I can intelligently respond to that question as you have put it currently.