The son of a Motown Records behind-the-scenes legend and inspiration for bassists the world over said he's planning to pay tribute to this father the best way he knows how. James Jamerson Jr. said he will strap on a bass Friday and play his father's part on "What's Going On," the Marvin Gaye hit that the elder Jamerson "always bragged about." He will play during the National Association of Music Merchants show in Anaheim, Calif., and join his mother, Annie Jamerson, and other family members to accept the International Bassist Award on behalf of James Jamerson Sr., who died in...