Spock's Beard keyboardist/vocalist  Neal Morse , Flower Kings guitarist Roine Stolt  and Marillon bassist  Pete Trewavas . Portnoy has also recorded and/or toured/performed live with  Avenged Sevenfold ,  Neal Morse ,  OSI , Hail!, Stone Sour ,  Fates Warning ,  Overkill  and  G3 . Over the years, Portnoy has also created tribute