Be Careful, It’s My Heart is a song written by Irving Berlin for the 1942 musical film Holiday Inn. The story in the lyrics centers on a lover warning that the heart is precious and must be handled with care. The original performer in the film was Bing Crosby, with the first theatrical release on August 4, 1942, and a popular recording by Tommy Dorsey and His Orchestra with Frank Sinatra on the vocal refrain released in July 1942. It appears on the Holiday Inn soundtrack, placing it in the traditional pop and big band genre of the early 1940s. The tune remains a standard of the Great American Songbook and showcases Berlin’s memorable melody and witty, heartfelt lyric.