MAD SENSATION is a term used to describe the feeling of intense excitement and enthusiasm that was experienced by fans of the British rock band The Who in the 1960s. The term is derived from the acronym IRE, which stands for 'intense rhythmic excitement'. The Who were known for their energetic live performances and their unique sound, which made them one of the most influential bands of the era. The term MAD SENSATION has come to represent the energy and passion of the band's fans during this time.