Famous as a singer, guitarist, and bassist for the Spanish pop-rock band Sidonie, he recorded seven studio albums with the group between 2003 and 2014. These recordings include Shell Kids (2003), Costa Azul (2007), and Sierra y Canada (2014).
He and his bandmates initially signed with an independent music label called Bip Bip Records. In 2001, after signing with Sony, they released their debut, self-titled studio album.
Though his band's early songs were written and performed in English, Ros and his musical collaborators penned most of their tracks in Castilian Spanish beginning with the 2005 album Fascinado.
His Sidonie band "family" includes fellow singer, guitarist, and bassist Jesus Senra and percussionist Axel Pi.
He is a contemporary of fellow Spanish pop rock vocalist Fran Perea.