Here is the Turkish birthday song for Coşkun, which follows the traditional melody with the lyrics "İyi ki doğdun Coşkun," "İyi ki doğdun, iyi ki doğdun," and "Mutlu yıllar sana!". You can also express your warm wishes with classic phrases like "Yeni yaşın sana sağlık, mutluluk ve huzur getirsin," or heartfelt messages including "İyi ki varsın" to celebrate his special day.