Theofilos Xenidis, better known as Phil X, is a Canadian musician, singer and songwriter. Since 2013, he has played lead guitar with Bon Jovi and officially replaced former lead guitarist Richie Sambora in 2016.

Bon Jovi is an American rock band formed in 1983 in Sayreville, New Jersey. The band currently consists of singer Jon Bon Jovi, keyboardist David Bryan, drummer Tico Torres, guitarist Phil X, and bassist Hugh McDonald. Original bassist Alec John Such left the band in 1994, and longtime guitarist and co-songwriter Richie Sambora left in 2013. The band has been credited with "bridging the gap between heavy metal, rock and pop with style and ease".