The Bhagavad means God Gita and means Song. So it is “Song of God”. Also rhyming meter of Bhagavad-Gita is so harmonic and melodious, when spoken perfectly. Krishna says in the Bhagavad Gita:
Among the Vedas I am the Sama Veda. Sama Veda is the first successful human effort to formalise and theorise music. It is the string that binds the other three Vedas together.