Psalms 81:1 Kabbalah

לַמְנַצֵּ֬חַ ׀ עַֽל־הַגִּתִּ֬ית לְאָסָֽף׃

For the Leader; upon the Gittith. [A Psalm] of Asaph.

Read kabbalistic (mystical) interpretation of Psalms 81:1: and classical mystical sources.