Work with multiple lyric languages

What’s the correct way of adding the lyrics language to a work if there’s 2 or more languages: list all the languages, use [Multiple languages] or both? Since using [Multiple languages] prevents me from adding any other languages, I’m assuming I should list all of them, but I’d like some clarity.

On a related note, how much of a work’s lyrics need to be in a language to warrant adding it? I’m assuming one line isn’t enough.

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Once upon a time we could only state one lyrics language per work.
Then, the [multiple languages] was necessary.

Now, for instance, when you cannot name all the languages (because you don’t understand) in the lyrics, you can still use [multiple languages].