Gioeli's musical career began in the early 1980s after forming the band Phaze with his older brother, Joey.

Killerhit re-located to Hollywood and hooked up with bandmate and guitarist Christopher Paul's friend Bret Michaels, Poison's lead singer.

Realizing the band needed for a front man, Gioeli left the drum stool for center stage.

After they changed their name Brunette, the band broke The Doors and Van Halen's single-weekend attendance records on the Sunset Strip in Hollywood, California.

Gioeli had all but disappeared from the music scene until, in 1998, German guitarist Axel Rudi Pell found himself in need of a vocalist after the departure of Jeff Scott Soto.

He also participated in Michael Voss's compilation album titled Voices Of Rock - MMVII, released on July 20, 2007, on which he performed the song "Phoenix Rising".

[4] After considerable success of their debut CD, Double Eclipse, the band was dissolved for ten years during which Gioeli and his brother followed a career in internet business.

On December 22, 2011, Gioeli confirmed, via Frontiers Records official site, that he and Italian producer and keyboard player Alessandro Del Vecchio would release Hardline's fourth studio album Danger Zone on May 18, 2012, yet again with a new lineup.

In addition to being a vocalist for two bands, he has also been working with video game composer and musician Jun Senoue and has delivered his vocals in the Sons of Angels CD; Thrill of the Feel, released in 2000.

In October 2008, Gioeli and Senoue took the stage at the Tokyo Game Show to perform some of their most popular Sonic-based songs in front of a live audience for the first time.

This compilation album contains most of the band's Sonic the Hedgehog releases as well as a mixture of old tracks from the NASCAR Arcade game and some brand new songs including a cover of "Un-Gravitify", the main theme of Sonic Riders: Zero Gravity, a cover of the Cult's "Fire Woman", and an original ballad entitled "Is It You".

Gioeli provided his vocals for the song "Crushing Thirties" by The Chalkeaters, a three man music group out of Saint Petersburg, Russia.

[10] That December, he sued Sega for unpaid royalties from the song's use in ports of Sonic Adventure 2 and subsequent games.