From The Guardian:
Jim “Motorhead” Sherwood, who has died aged 69, was a member of Frank Zappa’s original Mothers of Invention. He appeared on all the group’s early albums, up to and including Weasels Ripped My Flesh (1970), as well as on Zappa’s solo disc Lumpy Gravy. He later performed with the Grandmothers, a group of musicians who had accompanied Zappa during different phases of his career.
• Jim Sherwood: http://en.wikipedia.org/wiki/Jim_Sherwood
• Mothers of Invention: http://en.wikipedia.org/wiki/The_Mothers_of_Invention