As I am one of the rare people around here who yodel & like surprising others with it...where can I find sources of this style of music? I only remember a few tunes from 3 childhood records of Elton Britt, Grandpa Jones (who just died, sad to say), & Slim Whitman. I lost those recording years ago. I am also just as fond of the Swiss style ("L" sounds), besides the American style ("D" sounds). Any suggestions?