"Open up Your Heart (and Let the Sunshine in)" is a popular song. It was written by Stuart Hamblen. The song was published in 1954.
The biggest hit version in the US was a recording by Stuart Hamblen's Cowboy Church Sunday School (peaking at #8 on the Billboard charts); in the UK, by Joan Regan and her son Rusty. Another US recording was made by the McGuire Sisters.
When the Cowboy Church Sunday School version is played at normal speed, 45 rpm, the vocal sounds unnaturally high. When played at 33⅓ rpm the vocal sounds more natural. In fact the song was recorded at that speed by Stuart Hamblen's wife and adult daughters, so that when played at 45rpm it sounds as if it is being sung by small children.
The version sung by The Cowboy Church Sunday School was featured twice in the John Waters film "A Dirty Shame." The song was first used as an angelic juxtaposition to the intolerant concept of "Not In My Back Yard." It was later used satirically in a scene depicting the religious aspects of 12-step programs.
- thumb|300px|right|Pebbles & Bamm-Bamm - Open Up Your Heart And Let The Sunshine In (Original Full Length Mix). © HBP and successor entities.The most famous recording of this song for baby-boomers featured Pebbles and Bamm-Bamm on The Flintstones "No Biz Like Show Biz" episode. The clip of the them performing this song was sometimes played during the closing credits in the show's final season (1965-1966). Although Pebbles and Bamm Bamm went on to form a rock band as teenagers in the 1970s, they never approached the classic heights of their infant tune. The Flintstones version of the song was stripped of some its religious lyrics for inclusion in the show. Original vocals were provided by Rebecca Page (as Pebbles) and her mother Ricky Page (as Bamm Bamm), who later became "The Bermudas" and then "The Majorettes". They were managed by George Motola, who was Ricky's husband.
- Frente! recorded a cover of the song for inclusion on the 1995 tribute album Saturday Morning: Cartoons’ Greatest Hits, produced by Ralph Sall for MCA Records.
- Anne Murray included the song (in a medley with "You Are My Sunshine") on her 2001 album "There's A Hippo In My Tub."
- ↑ CD liner notes: Saturday Mornings: Cartoons’ Greatest Hits, 1995 MCA Records