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Halsey has guided the careers of such illustrious personalities as Roy Clark, The Oak Ridge Boys, Waylon Jennings, Reba McEntire, Clint Black, Minnie Pearl, Tammy Wynette, Merle Haggard, Dwight Yoakum, The Judds, Lee Greenwood, Hank Thompson, Woody Herman, James Brown, Roy Orbison, Leon Russell, Ricky Nelson, The Righteous Brothers, and many others.
John's music promotion company JHM Dull Productions has worked with various artist including Pete Seeger, Peter Paul and Mary, The Oak Ridge Boys, Richie Havens, Uncle Floyd, Emmylou Harris, Tom Paxton and Tom Chapin among many others.
Solo work included appearances with The New Christy Minstrels as their only female leader, a stint on Johnny Cash's ABC television show, and opening act performances for country musicians such as Hank Williams, Jr., Mel Tillis, Roy Clark, and The Oak Ridge Boys.
Amidst the popularity of The Oak Ridge Boys (specifically when they switched to country music and the hit Elvira), many compilations were made with some of the material from their Skylite recordings.