Psalms 77:1 Kabbalah

לַמְנַצֵּ֥חַ עַֽל־ידיתון [יְדוּת֗וּן] לְאָסָ֥ף מִזְמֽוֹר׃

For the Leader; for Jeduthun. A Psalm of Asaph.

Read kabbalistic (mystical) interpretation of Psalms 77:1: and classical mystical sources.