Throughout the years, Marcello played in various bands such as Stetson Cody Group, Norbom Hilke and Noice, before he formed Easy Action in 1982.

They recorded That Makes One in 1985–1986 and released it in 1986, only months before Marcello left the band in November 1986 to join Europe, replacing their original guitarist John Norum.

Marcello had previously collaborated with Europe vocalist Joey Tempest on the hugely successful single "Give a Helpin' Hand" for the charity project 'Swedish Metal Aid'.

When he joined Europe in 1986, the band had not done any extensive touring outside Sweden, but that was about to change when "The Final Countdown" eventually reached number one on the singles charts in 25 countries.

Ex-Thin Lizzy keyboardist Darren Wharton's group Dare supported the band on the European leg of the tour.

Marcello, who in 1987 emigrated with the rest of the band to the Caribbean in an attempt to escape the then ferocious Swedish margin tax, was spending most of his time in Los Angeles when not in Providenciales on Turks and Caicos Islands.

In 1993, Marcello joined former Easy Action drummer Freddie Von Gerber in the band Red Fun, and released a self-titled album that featured a melodic metal sound with heavy blues influences.

Kee Marcello's K2 toured extensively all over Europe and the East during 2008–2009 and performed in the 2007 Swedish Eurovision song contest with Alannah Myles.

After having more than 2,000 applicants, Marcello and TMS Management put together an audition for members to his new band at Little Halings, London, in November 2010.

The line-up rounded out by Ken Sandin on bass guitar and Italian drummer Marco Di Salvia (Hardline, Pino Scotto).

The guys started working on the album in late 2016 with songwriting and direction of producer Alessandro Del Vecchio, that played keyboards on.