The document provides background information on club music genres such as house, techno, trance, garage, and drum 'n' bass. It discusses how developments in music technology from the 1970s onwards enabled new electronic dance music styles. Remixing techniques allowed elements of songs to be reused, extended and looped to keep dancers on the dance floor. Common musical traits across genres included a 4/4 beat, prominent electronic sounds, and a strong repetitive bass line and drums. Specific genres like house, techno, drum 'n' bass, and garage originated in different cities and time periods, influencing each other as electronic dance music spread globally.