Terry Ilous moved to Hollywood from Lyon, France in 1984, and formed the metal band XYZ along with friend and bassist Pat Fontaine. XYZ released their debut self-titled album [produced by Don Dokken] in 1989 on Enigma Records; followed by the 1991 Capitol release “Hungry” and “Take What You Want Live U.S" in 1995, with a Euro. Edition to follow in 1996. The band quickly gained attention selling over 1.5 million records world wide and played with artists such as Ozzy Osbourne, Foreigner, Soundgarden, Ted Nugent, and Alice Cooper. XYZ consistently released albums over the following years with “Letter to God” in 2003, “Forbidden Demos” in 2005, and “The Best of XYZ” in 2008.
In 2009 Terry was contacted to play a handful of dates with hit 80's recording artists Great White. By 2011 Ilous became the official lead singer for the band, quickly heading out on an extensive U.S. tour. By 2012 Great White had released their first CD with Ilous,"Elation". The positive response from fans and press alike was overwhelming; with 3 videos, and the song “Hard to Say Goodbye” (written by Ilous), reaching number 8 on Billboards Classic Rock Radio Chart. And in June 2017 the band released their 13th studio album 'Full Circle', by renowned producer Michael Wagener, with songs written by Great White, Terry Ilous & JK Northrup. 'Full Circle' was the last album to feature Ilous as lead vocalist.