The photo shows a Turkish singer named Yunus Bülbül. The joke in Turkish is that his last name, "Bülbül" means "nightingale" in Turkish. The wordplay comes from the fact that nightingales are known for their beautiful singing voices, and Yunus Bülbül is a singer. This creates a playful association between his name and his profession. The joke is a simple one, but it's a common type of wordplay in Turkish humor. It relies on the listener understanding the double meaning of the word "Bülbül."