My attempt at 0:23
Hey, if you guys have any suggestions of how to improve this technique or want to learn any tips, feel free to add me on facebook, the name is the same of the channel.
I just learned how to do this crazy trick, some people call this "chord singing" or "polyphonic singing". I think it's close to whistle tones because when i go higher with this technique, the "low note" disappears and turns into a clear whistle note.

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