לַמְנַצֵּ֣חַ עַל־שֹׁ֭שַׁנִּים לִבְנֵי־קֹ֑רַח מַ֝שְׂכִּ֗יל שִׁ֣יר יְדִידֹֽת׃
For the Leader; upon Shoshannim; [a Psalm] of the sons of Korah. Maschil. A Song of loves.
Read kabbalistic (mystical) interpretation of Psalms 45:1: and classical mystical sources.