Jewish tradition equates the two lovers with God and Israel. So in this light, having 60 queens over Israel throughout time is certainly possible. If you want to interpret this literally as one man and one woman, then the important point to pull from Song of Songs is that the queens and concubines praise the dove, the perfect one, who is called blessed. So who is this blessed one of Solomon, who had 700 wives? The only time we see Solomon place a throne beside him is in 1 Kings 2:19
Then Bethsabee came to king Solomon, to speak to him for Adonias: and the king arose to meet her, and bowed to her, and sat down upon his throne: and a throne was set for the king's mother, and she sat on his right hand.
This shows the Middle Eastern custom of that time to have the Gebira or King's mother rule alongside her son.
This is also shown in 2 Kings 24:12 and in Jer 13:18, which states about the fall of Jerusalem to the Babylonians,
Say to the king, and to the queen: Humble yourselves, sit down: for the crown of your glory is come down from your head.
If you want non-Catholic sources for this tradition, please follow this link to several bible commentaries at biblehub.com
Jeremiah 13:18 Commentaries: Say to the king and the queen mother, "Take a lowly seat, For your beautiful crown Has come down from your head."