In 1982, Xenidis formed the hard rock-heavy metal band Sidinex (naming it after himself, the moniker being his last name spelled backwards) with singer Todd Farhood, bassist Kevin Gingrinch and drummer Scott Masterson. The band released only one EP in 1985, Forever Young, before changing name to Flip City in 1987 and disbanding soon after. An opportunity in Xenidis' career came when he was asked in 1990 to tour with Randy Coven, whom he met through Aldo Nova; in 1991, he toured the US with Aldo Nova. From 1992 to 1993 he played with Triumph, recording Edge of Excess and touring with them.
In 1994, Xenidis collaborated with Terry Brown, Doug Varty, Rob Kennedy and others to form a short lived band, The Bushdoctors, in Mississauga, Ontario. They recorded one album, a self-titled debut, now out of print. Also in 1994 he played a guitar solo for Our Lady Peace's song “Denied” from the album Naveed. Phil X was guitarist for US power pop band Powder alongside vocalist and then-wife Ninette Terhart. The band released three albums between 2002 and 2008.
In 2011, Phil X substituted for Bon Jovi's lead guitarist Richie Sambora, who missed 13 dates after entering rehab, and later filled in for Sambora on the US and Europe leg of the 2013 tour after Sambora left the band suddenly due to personal reasons. It was a mutual friend between Phil X and Jon Bon Jovi, Arman Ghasemi, who recommended to Jon Bon Jovi to use Phil X as a substitute.

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