Listen to I Cain't Say No online. I Cain't Say No is an English language song and is sung by Jacob Schwartzdorf, St. James Theatre Orchestra and St. James Theatre Chorus. I Cain't Say No, from the album Oklahoma! (Original Broadway Cast 1943), was released in the year 2013. The duration of the song is 3:32. Download English songs online from JioSaavn.