Listen to 快樂 online. 快樂 is an Instrumental language song and is sung by The Big 鋼琴. 快樂, from the album 我是天才- 鋼琴曲為了提高注意力讓你好好學習, was released in the year 2018. The duration of the song is 4:06. Download Instrumental songs online from JioSaavn.