Singing career
John Gilliland Collection, 1955-1991 | Music Library
https://findingaids.library.unt.edu/?p=collections/findingaid&id=959&q=&rootcontentid=204947AllMusic - Wikipedia
https://en.wikipedia.org/wiki/AllMusicNick Perito Songs, Albums, Reviews, Bio & More | AllMusic
https://www.allmusic.com/artist/p113573/biographyRealPlayer - Wikipedia
https://en.wikipedia.org/wiki/RealPlayer