listening to yodelling music

Not yodelling, but for lots of very loud and unique "music" there is "Fasnacht".
This is an annual carnival. It exist in some Swiss and many German cities. In northern Germany it is called "Fasching" and there is a big one in Cologne. Its character varies depending on where you are. The biggest Fasnacht in Switzerland is in Basel, it last 3 days and has 18000 costumed participants (not counting people watch in normal clothes). It is 3 totally mad days.

For a sample of the "music" I found this on YouTube. See which of the "tunes" you can recognise: https://www.youtube.com/watch?v=gr1dPHjwEDU

Info here: https://www.baslerfasnacht.info/basel-fasnacht/index.php
and here: https://www.basel.com/en/carnival-in-basel

Basel Fasnacht 2019 starts on Monday 11th March. Most other places (including Germany) have theirs a week earlier.

The next Swiss National Yodel fest is schedule for Basel in June 2020.
https://www.carnifest.com/switzerlands-national-yodeling-festival-eidgenossisches-jodelfest-2020/

Here are some regional festivals in 2019. Brienz (near Interlaken), Winterthur (near Zurich), Horw (outside Luzern), Muemliswil (about an hour south of Basel).
http://www.jodlerverband.ch/jodlerfeste/unterverbands-jodlerfeste

No yodelling, but a lot of brass band and drum music during the Luzern Canival parade day. Music started before breakfast continued before during and after the Carnival afternnon parade. March 4, 2019 is Carnival Monday.

https://www.inyourpocket.com/lucerne/Lucernes-crazy-carnival_73566f

For a few days in late winter Lucerne goes wild. The streets are full
of people in wild and wonderful masks, playing horrendously loud music
on trumpets, horns and drums – this is fasnacht, the Swiss version of
carnival.

Many Luzerner literally live for this celebration which takes place in
February or March, waiting all year for fasnacht to come, creating new
elaborate costumes and rehearsing their music routines in many
fasnacht- associations, guilds or brass bands (guggemusig).

https://www.myswitzerland.com/en-us/carnival-in-lucerne-lu.html

A major attraction of the Lucerne Carnival are the Guggemuusige, or
improvised (masked) bands. They are dressed-up and masked or made-up
carnival cliques who play well-known tunes on their brass and
percussion instruments, rather loudly and not really in tune. The
first of these groups was formed around 1950, taking its example from
Basel. In the meantime, their number has increased to a few dozen.
Unlike their counterparts in Basel, they do not march through the
street in strict formation, but make frequent stops, acting out scenes
and mingling with the crowd. There are also many individuals or small
groups disguised and playing a musical instrument, or pulling a
practical joke to liven things up. The masked balls attract huge
crowds and are held in large venues in the evenings.

One of the best local music events I've ever attended is the Alphorn Festival in Nendaz in the canton of Valais. Hundreds of Alphorn players from all over Switzerland, Europe, and the world gather to play together on a high mountain meadow. They form a massive half circle with the mountains in the background and play while flag throwers do their thing in the foreground. Everyone sits on the grass and enjoys the music. There are numerous performances throughout the day some very large and some very small.
If you get there at the beginning of the day you can watch the procession of local farmers with their cows' belled collars on their shoulders, clanging down from the mountain. There is food, local crafts, dance groups, Swiss wrestling, and I remember a fair bit of yodeling throughout the day. The whole event is still very local, not commercialized at all, and, last time I was there, we were just about the only people who weren't from the area or attending with the players.
Here is a link to the website...in 2019 the festival will be July 26 - 28.
Bitte!

Melanie Oesch from the Berner Oberland is famous throughout the German speaking world for her fabulous modern Jodeling.

The family has been performing for decades, and when she performs it is with her family as "Oeschs-die-Dritten" which although the name refers to the three, there are actually six now. She usually performs with her father, mother and two brothers (and a sixth).

I actually love her voice and both the singing and Jodeling.

They do concerts frequently in the Alps - in Austria, Germany and of course Switzerland. Tickets don't cost too much because they are usually in small venues (except when on TV in the huge halls).

Their website in German and English is at

https://www.oeschs-die-dritten.ch/en/

Lots of videos of them on YouTube so you can see what you might find.

Enjoy!!