Since the summer of 2003 Jonathan Perez plays drums in Sirenia, the Norwegian gothic metal band featuring former Tristania guitarist/vocalist Morten Veland. Perez is also known as drummer with Trial of Tears.
In November 2004 Perez is forced to sit out the band's European tour with Tiamat, Theatre Of Tragedy and Pain. Roland Navratil (Edenbridge) fills in on drums during the tour.