It is an example of a visual text
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The primary colors are red, yellow, and blue.
They are called primary colors because they form other colors when mixed together. Other colors cannot be mixed to form primary colors.
Four characters are in the midst of a very ambiguous and dramatic situation, but all of them sing their own respective text and music lines, which intertwine and create beautiful harmonies. The Duke and Maddalena interact, but Gilda and Rigoletto sing for themselves. The drama is frozen in a single moment. On the other hand, in a spoken play, the drama moves forward in such scenes. It isn't restrained by music.