To Have and Have Not (film) Carmichael and Stanley Adams. "The Rhumba Jumps", by Mercer and Carmichael, is performed by the hotel band. Bacall shimmies out at the end of the movie to a faster "How Little We Know". The song "Baltimore Oriole" was intended to be Bacall's theme for the movie, but was merely added as background music on the soundtrack due to Bacall's vocal inexperience. Background music or nondiegetic music is minimal in the picture. However, the film score including the main title was composed by Franz Waxman. According to professor of film studies Ian Brookes, Howard Hawks uses jazz, particularly through interracial performance
Joan Leslie as Betsy Phillips. She was chosen for the part because the director was searching for an actress with a southern accent. She was billed as "Joan Brodel". Later that year, she co-starred with Jimmy Lydon in "Two Thoroughbreds", in which she played the daughter of a horse owner. At age 15, Leslie was selected by a group of Hollywood directors as one of 13 "baby stars of 1940." Her big break came when she signed a contract with Warner Bros. in 1941. At the time, actress Joan Blondell's name was considered too similar, and so Brodel's acting name was changed