Yeah, most songs have two, sometimes three. That is the maximum typically.
you listed seven though, which is a lot more for this sort of thing. It would still be one of the first times something like this is done
in the way it seems you want it to be.
I'm not saying a song with more than 3 or 4 languages has never been done, I just mean that its limiting and song length compromises the ability to accommodate communicating anything meaningful. Songs that are too long within this genre tend to be unpopular, and a reasonable time frame song would require cutting out too much, shifting languages too quickly without giving any language the opportunity to express anything.
Some people listen to kpop without understanding what is being said- but words do serve a purpose, or else they wouldn't include any language- so at the very least, one group is going to have to be able to connect with the lyrics. And the other groups are still going to have to feel that the language jumps aren't too jarring, which is still an issue (an issue that will be touched on in a moment).
As for the b.i.g song
The only word they say in the other languages is "Hello". The overall song is still just in one language so that they can communicate a message without it being completely disjointed.
Some of the languages NCT speaks, the languages listed by
@JJbaker compliment each other but quite a few of them don't have much connecting them at all. Even the complimenting languages clearly still have quite a few differences. The only people saying they thought the Chinese sounded like Korean are complete foreigners. You don't have to speak Korean or Chinese to know that they are very clearly different if you've had even just a basic level of exposure.
These languages aren't similar in the way some European ones are- where speakers of two different European languages can still hold a conversation. It will be at times a confusing conversation, but one can be carried out none the less. None of these languages listed are anywhere close to that similar. Which presents song writing challenges.
Lyric writing changes in each language to structure appropriately to match the song. Some cultures tend to have more slow songs because its what sounds better with their languages. Some languages are naturally harder to perform certain tasks such as rapping in. With each cultures art style developed around their language, and from their language their experience of the world, certain countries and regions connect more to certain things. That country whose language benefits from soft slow songs is not probably going to want to quickly adapt a fast paced electro heavy song. It's a marketability issue.
Lyrics are like poetry and different languages and cultures have different styles of poetry that cater to their languages and even cultures themselves. Languages have different rhyming schemes, different language elements that compliment the imagery that culture uses, some languages have many very long words. In some languages, each word is only a syllable or two, changing the rhythm and the amount that can be expressed in one musical phrase, which is another reason why it is difficult to make a natural song with that many languages.
That is why most of the songs with that many languages are promotional songs with very basic phrases like
"hello" "I love you" "we are one" "peace" and similar short universal phrases. It's not just because they couldn't or didn't want to hire more involved translators. Its because those are the only the basic phrases can still get a message across without running the risk of the languages clashing.
@JJbaker , your idea is definitely a cool one in theory and I think it would also be a good move for SM to release a song with all of NCT's collective languages showcased
! I simply do not think that song can serve as much more than a plain, simple, promotional song, and those are my reasons why I, as of this point in time, think so.