Lauren Bacall a visit to the National Press Club in Washington, D.C., on February 10, 1945. It was there that Bacall's press agent, chief of publicity at Warner Bros. Charlie Enfield, asked the 20-year-old Bacall to sit on the piano while U.S. Vice President Harry S. Truman played. After "To Have and Have Not", Bacall was seen opposite Charles Boyer in "Confidential Agent" (1945), which was poorly received by critics. By her own estimation, it could have caused considerable damage to her career, had her performance as the mysterious, acid-tongued Vivian Rutledge in Hawks's film noir "The Big Sleep" (1946), co-starring Bogart,
What Love Is Made Of three minutes and fifty-five seconds (3:55), "What Love Is Made Of" is an uptempo dance and house track that has been described as "rave-y" and "trance-y". Its instrumentation contains the sounds of pianos and synthesizers. Jordan Sargent of "Spin" observed that it continued the musical style first introduced in Katy's 2012 extended play (EP), "Danger EP", which was "straight-forward house". Idolator's Sam Lansky compared her performance in the song to recording artist Siobhán Donaghy. Critical response to "What Love Is Made Of" was generally positive: most critics noted Katy's vocal performance and commended its sound. Siân Rowe from "NME" was