New Delhi, March 1 Singer Arijit Singh released his first new song, "Raina," following his retirement from playback singing.Singh, known for tracks such as "Channa Mereya”, “Agar Tum Saath Ho”, “Raabta”, “Kesariya”, “Gerua”, “Ae Dil Hai Mushkil” and "Chaleya", shared the news with a post on...