In the 1960s, Darin owned and operated, with Terry Melcher, Doris Day's son, a music publishing and production company (TM Music/Trio). He signed Wayne Newton and gave him the song "Danke Schoen", which became Newton's breakout hit. Darin also was a mentor to Roger McGuinn, who worked for him at TM Music and played the 12-string guitar in Darin's nightclub band before forming the Byrds. Additionally, Darin produced Rosey Grier's 1964 LP "Soul City", and "Made in the Shade" for Jimmy Boyd.