Listen to Smile Again online. Smile Again is an English language song and is sung by Plug In. Smile Again, from the album Best of Top Electronic Dance Acid Techno House Rave Anthems Psytrance Festival Party 2015 (50 Songs True Dance Greatest Hits Club DJ Sessions the Biggest Hits of the Year), was released in the year 2015. The duration of the song is 4:10. Download English songs online from JioSaavn.