Task: Question Generation
Input (English): Passage: The album opens with "What You Waiting For?", an electropop, new wave, dance-rock, and funk song. Lyrically, the song discusses Stefani's fears of beginning a solo career. "Rich Girl", a collaboration with rapper Eve, is a dancehall and reggae reworking of the English duo Louchie Lou & Michie One's 1994 song "If I Was a Rich Girl", which itself interpolates the song "If I Were a Rich Man" from the 1964 musical Fiddler on the Roof. The Neptunes-produced track "Hollaback Girl" combines 1980s hip hop with dance music. It was written as a response to a derogatory comment that grunge musician Courtney Love made, referring to Stefani as a cheerleader.The fourth track "Cool" chronicles Stefani's previous relationship with Tony Kanal, featuring a new wave and synth-pop production. The song was compared to Cyndi Lauper and Madonna songs from the 1980s. "Bubble Pop Electric", the fifth track, is an electro song featuring André 3000's alias Johnny Vulture. It tells of the two having sex at a drive-in movie, and it was generally well received by critics, who drew comparisons to the 1978 film Grease and its 1982 sequel Grease 2. "Luxurious" is a 1990s-inspired R&B song that lyrically talks about the desire to be rich in love, simultaneously comparing Stefani's lover with luxuries. The seventh track, "Harajuku Girls", is a synth-pop song that was described as a tribute to Tokyo's street culture, produced by Jimmy Jam and Terry Lewis."Crash" is an electroclash song that uses automobile metaphors to describe a relationship. "The Real Thing" was described as a vintage Europop song, and features guest appearances from New Order vocalist Bernard Sumner and bassist Peter Hook. The next track, the synth-pop song "Serious", drew comparisons to Madonna's work during the early 1980s. A music video was produced for the song, but it was never officially released, although a snippet of the video surfaced on YouTube in October 2006. "Danger Zone", an electro-rock song, was widely interpreted to be about Stefani's husband Gavin Rossdale having an illegitimate daughter; however, the song had been written before the discovery. The closing track "Long Way to Go" is an outtake from André 3000's album The Love Below (2003). The song discusses interracial dating and uses a sample of Martin Luther King's "I Have a Dream" speech.
Output (English): What song uses a sample of Martin Luther King's "I Have a Dream" speech?