but to greenlight the project. Filming began in October 1986, in New York, but it was not until January 1987 that Madonna started working on the soundtrack. Development Having some specific ideas in her mind about the music of the film, Madonna contacted Patrick Leonard and Stephen Bray, who had helped to write and produce her third studio album True Blue in 1986. Madonna explained to them that she needed an uptempo song and a downtempo song. As per her demands, Leonard developed the uptempo song. Madonna came to the recording studio one Thursday, and Leonard handed her a cassette of a recording of the chorus, which he had just finished working on. Madonna went to the backroom and completed the melody and the lyrics of the song, while Leonard worked on the other parts of it. After finishing the lyrics, Madonna decided to name the song "Who's That Girl", and changed the title of Slammer to the same, considering it to be a better name. In Fred Bronson's book The Billboard Book of Number 1 Hits, Leonard explained that the song was recorded in one day with Madonna recording her vocals only once. Additional guitar and percussion tracks were added later by Leonard and Bray. The downtempo song was developed on the following day, with Madonna writing the lyrics and Leonard composing the melody. Named "The Look of Love", the song contains the line "Nowhere to run, no place to hide. From the look of love, from the eyes of pride". Madonna was inspired by the look that actor James Stewart gave actress Grace Kelly in the 1954 film Rear Window. Madonna said: "I can't describe it, but that is the way I want someone to look at me when he loves me. It's the purest look of love and adoration. Like surrender. It's devastating." After "The Look of Love", Madonna went on to develop two further songs with Bray as the producer. The first was called "Causing a Commotion", and was inspired by Penn and the couple's often tumultuous relationship. Madonna felt that her marriage to Penn was on the verge of breaking up, due to Penn's abusive and violent nature. In a Rolling Stone article dated September 10, 1987, Madonna spoke about Penn's impact on her life and the song: "I don't like violence. I never condone hitting anyone, and I never thought that any violence should