oh gosh, learning german in switzerland does not really make a lot of sense, when you intend to use that Kind of german in any other germanspeaking Country !!!
They have a terrible dialect that they use in everyday life and also on TV & Radio and they also make terrible mistakes and use german words in wrong ways etc.
In my first 2 weeks in Switzerland I did not understand a word, although german was my mothertongue

Haha, I have to agree with Globetrott. Although if he is going to Switzerland to learn German for 2 hours a day, I am guessing that he either already has a base in German or you're expecting more of a cultural experience than for him to be able to master German.

You say he likes music? Well, from 13-24 August, the Winterthur Musikfestwochen is going on in the Old Town area with a wide variety of music playing each day. I have no idea ticket prices or if you/he would be comfortable with him going, but I am guessing you can find out more online.

I hope they'll teach standard German, or your son will be very frustrated when he tries to speak Swiss German in Austria or Germany and finds that nobody understands a word.

~~oh gosh, learning german in switzerland does not really make a lot of sense, when you intend to use that Kind of german in any other germanspeaking Country !!! ->It is possible to learn standard German in Switzerland. However, its a different story on the streets see my answers below.

~~They have a terrible dialect ->Standard German is a foreign language for Swiss german speaking people! We use standard German only for written purposes. That's the reason why most Swiss german speaking people don't speak standard German at a proficency level.

~~In my first 2 weeks in Switzerland I did not understand a word, although german was my mothertongue ->Swiss German has a different rules and gramatics and we use different words and German words in a different manner. Treat it as a different language, even if it not registered as such.

Moreover, please improve your cultural understanding! Switzerland is not a part of Germany and the German culture.

@ DJ-HEHE
I see you totally agree with me that it is NO good idea to learn German in Switzerland, except when you plan to use that knowledge ONLY in Switzerland !
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you say: ""Standard German is a foreign language for Swiss german speaking people! We use standard German only for written purposes. That's the reason why most Swiss german speaking people don't speak standard German at a proficency level. ""
This is exactely what I said !!!
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you say: Swiss German has different rules and gramatics and we use different words and German words in a different manner. Treat it as a different language, even if it not registered as such.
I say : exactely, and that is another reason not to learn german in Switzerland !
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you say: Moreover, please improve your cultural understanding! Switzerland is not a part of Germany and the German culture.
I say: another reason NOT to learn german there !