[1][2] Firmo was also the main songwriter on Room Experience, an international melodic rock project featuring David Readman.
[3] In 2013, Firmo met Davide Barbieri and Pierpaolo Monti and created a melodic rock project called Room Experience,[4] based on his own songs and featuring David Readman (Pink Cream 69, Voodoo Circle) on vocals, as well as many other guest musicians from the European AOR/Melodic hard rock scene.
[5][6][7][8][9][10][11][12] In 2015, Firmo was recruited by producers Pierpaolo Monti and Davide Barbieri to be part of the I.F.O.R project (Italian Forces of Rock).
[16] In 2016, Firmo contributed as songwriter to Raintimes, an international band led by Pierpaolo Monti and Davide Barbieri, featuring Micheal Shotton (Von Groove, L.R.S.)
[17] In 2017, Frontiers Records released A World of Fools, the third album by Lionville, where Firmo penned the title track and "Bring Me Back Our Love", along with Bruce Gaitsch.