Dr. Cusic has been actively involved in the music business since 1973 as an author, teacher, historian, musician, songwriter, and executive. He has authored twelve published books including the biography of Eddy Arnold: I'll Hold You In My Heart, an encyclopedia of cowboys, Cowboys and the Wild West: An A-Z Guide from the Chisholm Trail to the Silver Screen, Reba McEntire: Country Music's Queen, and Randy Travis: King of the New Traditionalists.  He has also written album liner notes for artists such as Dolly Parton, Willie Nelson, and George Jones and assisted on the Time-Life series on Country Music. As a songwriter, he has had songs recorded by the Lewis Family, Linda Davis, Carrell McCall, and Chris Ledoux.

At one time, Dr. Cusic hosted a television show called, The Music Biz, written for The Nashville Network and appeared a number of times on programs including, The Life and Times of Eddy Arnold, the A&E Biography series on Hank Williams, and the BBC series - Lost Highway: The History of Country Music. His jobs in the music industry have included working as a staff writer for the Country Music Association, head of Artist Development and International Liaison for Monument Records, Nashville editor for Contemporary Christian Music Magazine, and also serving on the Board of Directors for the Gospel Music Association.