שִׁ֥יר הַשִּׁירִ֖ים אֲשֶׁ֥ר לִשְׁלֹמֹֽה׃
THE song of songs, which is Solomon’s.
Rashi on Song of Songs
Elohim said one, I heard two (Ps.62:12). One text can yield multiple meanings, but at the end of the day, a text cannot be disconnected from its literal meaning (pshat). Even though the prophets spoke through examples (symbol, metaphor...) the metaphor must fit with the style and order of the text, as the texts are ordered.
Ezra ben Solomon on Song of Songs
The Song of Songs: The most pleasant of canticles, the choicest of songs; words of might recited by the Throne of Glory,35Usually understood by Kabbalists as referring to malkhut, the tenth sefirah, the feminine-receptive aspect of the Godhead. day to day expressing utterance, standing in prayer in good order arrayed, its speech lucid, in all things well ordered and sure.
Rashi on Song of Songs
I have seen multiple midrashei aggada (exegetical interpretations): Some organize this entire book in one complete compilation of midrash, while others have pieces scattered in multiple places.