"Open Up Your Heart (And Let the Sunshine In)" (sometimes seen as "Open Up Your Heart") is a popular song written by Stuart Hamblen and first published in 1954. The original version was by the Cowboy Church Sunday School and was a hit in the United States, peaking at number 8 on the Billboard charts. Another widely known US recording was released shortly after by the McGuire Sisters, and the United Kingdom saw a version by Joan Regan and her... [more on Wikipedia]