Answer
The answer is "Adio." Željko Joksimović, a renowned Serbian singer-songwriter, composed the song "Adio" for Montenegro's entry at the Eurovision Song Contest in 2013. The song, performed by Who See, was a heartfelt ballad that captured the emotions of farewell and longing. It placed 19th in the final, leaving a lasting impression on audiences with its poignant lyrics and haunting melody.