Ralphi Rosario is an American house musician and founding member of the influential Chicago DJ group Hot Mix 5. == Biography == When Hot Mix 5 was formed in 1981 on radio station WBMX (now WVAZ), Rosario, the youngest member of the group, was still in high school. The Hot Mix 5 went on to become one of the leading forces in the early Chicago house music scene. Like other members of the group, Rosario eventually branched out into music... [more on Wikipedia]