Having created a buzz at the auditions, Cooper found himself with offers to sing for many European and American bands.

[1] After spending four years with Royal Hunt, Cooper was suddenly and unexpectedly fired from the band, which he discovered by reading an announcement on their website.

[2] His next project, a solo album that he began in 1998, enlisted the help of musicians from many well known bands (among them guitarist Tore Østby of Conception, and members of Pink Cream 69).

After a successful tour, Cooper formed a new band with former Sinner guitarist Alex Beyrodt called Silent Force.

Cooper recorded lead vocals for the Italian band Derdian for their album "Revolution Era".