Listen to Raganuraga Hrudayangal - Happy online. Raganuraga Hrudayangal - Happy is a Malayalam language song and is sung by K.J. Yesudas, S. Janaki and A.T. Ummer. Raganuraga Hrudayangal - Happy, from the album Thadaakam, was released in the year 1982. The duration of the song is 4:54. Download Malayalam songs online from JioSaavn.