sentences:  Trendle and Campbell sold WTAC to a Hawaii-based group in 1954.Under the ownership of Radio Hawaii, Inc., WTAC shed its NBC affiliation to become one of Michigan's first Top 40 music stations in 1956.Its original program director was Mike Joseph, who would launch the legendary WKNR "Keener 13" in Detroit in 1963 and later went on to create the Hot Hits format in the early 1970s.