Listen to Open Up Your Heart (And Let The Sunshine In) online. Open Up Your Heart (And Let The Sunshine In) is an Unknown language song and is sung by Cowboy Church Sunday School Choir. Open Up Your Heart (And Let The Sunshine In), from the album Timeless 50's Revisited, was released in the year 2009. The duration of the song is 2:57. Download Unknown songs online from JioSaavn.