Question: What is the name of the bassist, one of the founding members of the Seattle based American Rock band Soundgarden, who left the band in 1989 and started an independent rock band Truly together?
Sentence (from "Hiro Yamamoto"): He left the band in 1989, and two years later, he started the independent rock band Truly together with Screaming Trees drummer Mark Pickerel and Robert Roth from The Storybook Krooks.
Relevant evidence: Yes