Yodel is sung across different countries. For Koreans, the word "Yodel" automatically equates to Switzerland only. Thus, they find it hard to believe that yodeling exists outside of Switzerland.
Likewise, foreigners from other countries are similarly surprised when I introduce myself as a yodel advocate from Korea. They, too, find it hard to believe that Koreans sing yodel.
Perhaps we are all caught up in and bound by stereotypes that makes such situation possible. What I would like to insinuate here is that Yodel truly is present all over the world. We are just not aware that different nationalities sing yodel.
Based on my experiences, yodel is a common thread which connect strangers from different origins. Yodel allowed me to travel the world and meet fellow yodel-enthusiasts. Even though we speak different languages, we have yodeling to help us understand each other. For me, yodel is a song for all mankind :)