Listen to Tomorrow Will Be A Happy Day (25 Lullabies Album Version) online. Tomorrow Will Be A Happy Day (25 Lullabies Album Version) is an English language song and is sung by Kids Choir. Tomorrow Will Be A Happy Day (25 Lullabies Album Version), from the album 25 Sleepytime Songs, was released in the year 2003. The duration of the song is 2:06. Download English songs online from JioSaavn.