Question: In *Asterix and the Magic Carpet*, [Cacofonix's](https://www.asterix.com/en/portfolio/cacofonix/) singing produces rain. (Previously, this had never happened.)

**Why is it that when Cacofonix sings, it rains in #28 (*Magic Carpet*, 1987), but not in Books #1-27 (1961-83)?** (Others may disagree, but I find this problematic, puzzling, and in need of explanation.)

(This effect also continues in the next book *Asterix and the Secret Weapon*.)

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Four of the five current answers simply quote from Wikipedia's (unsourced) assertion that there is a French saying that when one sings poorly, it rains.

This could very well be an explanation. But absent either in-universe (i.e. within the comic books, perhaps cleared up in later books) or out-of-universe (e.g. interviews with Uderzo) evidence, this is just speculation. Moreover, it is unsatisfying because it fails to address my above question (in bold).

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Edit: In case it isn't clear, I am not disputing the existence of such a French saying. I am disputing that the existence of such a French saying is a satisfactory explanation to my question. In particular, it fails to explain why Cacofonix's singing had not previously produced rain in the previous 27 books.

Answer: 
This is an ongoing joke that Cacofonix's singing is so bad, it causes negative things to happen (a common trope). 

[![A group proposes a toast at a banquet but Cacofonix starts signing in a  treehouse which causes it to rain; when he stops singing the rain stops again](https://i.stack.imgur.com/6xBoN.jpg)](https://i.stack.imgur.com/6xBoN.jpg)

According to [Wikipedia](https://en.wikipedia.org/wiki/List_of_Asterix_characters#Cacofonix) (My emphasis):

> 
> In Asterix and the Normans [his singing] is so unbearable that it teaches the fearless Normans the meaning of fear. In later albums his music is so spectacularly horrible that it actually starts thunderstorms (even indoors), **because of an old French saying that bad singing causes rain.**
> 
> 
> 

The joke even leads to him causing it to rain inside:

[![Cacofonix sings inside and it starts raining in the building, a gentlemen walks passed in the sun and notices it is only raining inside the bulding](https://i.stack.imgur.com/groSL.png)](https://i.stack.imgur.com/groSL.png)

And sometimes even leads to Cacofonix saving the day:

[![Cacofonix's singing started the monsoon season which was delayed resulting in people bathing in a stream](https://i.stack.imgur.com/wURO3.png)](https://i.stack.imgur.com/wURO3.png)
According to [the Wikipedia section on Cacofonix](https://en.wikipedia.org/wiki/List_of_Asterix_characters#Cacofonix):

> 
> In later albums his music is so spectacularly horrible that it actually starts thunderstorms (even indoors), because of an old French saying that bad singing causes rain.
> 
> 
> 

A French person reading the comics would automatically get the reference, and thus it isn't stated.