Matthias,Sonny is playing that song in 2nd Position on a key of "A" diatonic. He does not tongue block ever. He is using the Vertical Slot method and putting the harmonica further in his mouth to attain 3 note chords with the draw and blow, but he's mostly emphasizing the draw chords.
Here's more info on using chords-
http://www.harmonicalessons.com/members/chords.php
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Dave Gage
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