Duncan's early life was steeped in West Texas music. He picked this up naturally as a boy listening to his mother play rhythm guitar in his uncle's country band. Later, he began sharpening his vocal skills, influenced by his early idols Eddy Arnold, Perry Como, Jim Reeves, and Frank Sinatra. Johnny was born into a musical family. He is very proud of his talented and famous cousins, including Eddie Seals, Jimmy Seals of Seals & Crofts, and country singer Dan Seals. "He knew when he was 12 years old that playing music and singing songs was going to be his life", said his wife, Connie Duncan.