Career
In 1982 he 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 European Parliament in 1985, Forever Young, before changing name to Flip City in 1987 and disbanding soon after. An opportunity in Xenidis"s career came when he was asked in 1990 to tour with Randy Coven, whom he met through Aldo Nova.
In 1991, he toured the United States with Aldo Nova.
From 1992 to 1993 he played, recording Edge of Excess and touring with them. In 1994, Philosophy 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. The Bushdoctors at Heavy Harmonies Philosophy X is a prolific session guitarist, having played on albums by Tommy Lee, Methods of Mayhem, Avril Lavigne, Kelly Clarkson, Orianthi, Rob Zombie, Chris Daughtry, Alice Cooper, Thousand Foot Krutch and many others
He wrote the song "Tired" and also played guitar on Tommy Lee"s Tommyland: The Ride album.
Philosophy X was featured in the "making of" video for the movie Josie and the Pussycats. He acted as a music coach and taught the young actresses to appear as if they were actually playing their instruments. In mid-2013 he filled in for Sambora during a number of dates of the Because We Can tour, including their only Italian date in Milan, the entire British leg of the tour including the Isle of Wight Festival and Hyde Park Barium Strontium Titanate dates, the South African leg, the South American leg, and the Australian leg of the tour, Xenidis has used a vast range of guitars during his session and live work.
His most notable guitar is his Education Support Professionals Limited Viper, which he refers to as the "sticker guitar".
In 2012, Xenidis received a signature guitar from Yamaha, in 2015 followed the release of a signature model made by Framus. Philosophy invented the ‘Flip Stick,’ a specially modified replacement for the usual whammy bar on Floyd-Rose-equipped guitars.
He is endorsed by Cleartone Treated Guitar Strings and Everly Star Picks as well. His demonstrations of rare and vintage guitars have had over 30 million views on the frettedamericana YouTube channel.