Explanation:
* Coordination joins two or more grammatically equal elements (words, phrases, or clauses) using coordinating conjunctions (like "and", "but", "or", "nor", "for", "so", "yet").
* In this sentence, "The sun was setting" and "the birds were singing their evening songs" are two independent clauses joined by the conjunction "and".
* This creates a balanced and flowing sentence that connects two related ideas.