context: Hip hop or hip-hop music [1] [2] or rap music [2] [3] is a genre of music that was created in the United States in the 1970s which involves rap technique, which is a way of speaking that is voiced through rhythmic rhymes, accompanied by rhythmic background music [2]. This technique then developed as part of hip hop, a branch of culture that has 4 key elements: MCing / rapping, DJing / scratching with turntables, breakdancing, and graffiti writing. The sampling beat or bassline of the recording (or the synthesizing beat and sound) and rhythmic beatboxing are also included as part of hip hop music.
question: when did hip hop music first appear?
answers.text: 1970s