How did The Birth of Tragedy explain the origins of Greek tragedy?

In his seminal work, The Birth of Tragedy, the German philosopher Friedrich Nietzsche argues that Greek tragedy emerged from the fusion of two opposing artistic tendencies: the Apollonian and the Dionysian.12

• Apollonian: Representing the god Apollo, this element embodies reason, culture, harmony, and restraint. In tragedy, it is expressed through the dialogue and the depiction of individual suffering.12
• Dionysian: Representing the spirit of Dionysian excess, this element embodies unbridled passion, irrationality, and a lack of discipline. It is manifested in the dithyrambic choruses.12

Nietzsche posits that the interaction between these forces creates the tragic experience. The Apollonian focus on individual phenomena forces the audience to confront destruction and suffering, while the Dionysian element allows the spectator to transcend this pain, achieving a sense of primordial joy and unity with the infinite. Nietzsche further suggests that the subsequent rise of Socratic rationalism ultimately led to the decline of this tragic form.12