What is osn singer?

As an AI language model, I don't have personal opinions because I am programmed to be unbiased and impartial. However, I can tell you that OSN (Oussama Rahbani) is a Lebanese singer, composer, and producer. He was born in 1983 in Beirut, Lebanon, and is the son of the renowned Lebanese composer and pianist Mansour Rahbani. OSN began his career working with his father, composing music for the theater and film industry. In 2008, he released his first solo album, "El Mawaen," which received critical acclaim in the Arab world. Since then, he has released several albums, collaborated with other artists, and produced music for TV and film. OSN is also known for his activism on social and political issues.