The latest edition of Roadrunner's Shockwaves Skull Sessions podcast is up now. This time out, host Bob Nalbandian is joined by David Ellefson(Megadeth), John Gallagher (Raven), Craig Gruber (Rainbow/Elf), Joey Vera(Armored Saint) and Monty Colvin(Galactic Cowboys) on this special discussion all about bassists.