My favorite yodelers are too many to mention but they include Leon thomas [jazz, worked with Pharoah Sanders], Kishore Kumar [Bollywood], Shelley Hirsch [NY, avant-garde], Kenny Roberts, Cliff Carlisle, Randy Erwin, Mike Johnson - all for their own qualities. but if you'd indulge me and check out some of my recent yodel-themed radio shows many of them are included there
on WFMU [NY]: http://www.mixcloud.com/wreckthismess/wreck-the-drummers-yodel/
on Resonance FM [London]: http://www.mixcloud.com/wreckthismess/wreck-yodel-in-hifi-resonance/
on BBC: http://www.mixcloud.com/wreckthismess/wreck-dub-wire-yodel/
on Radio Patapoe in honor of Kenny Roberts: http://www.mixcloud.com/wreckthismess/wreck-yodelin-kenny-roberts/

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