This article is part of Overlooked, a series of obituaries about remarkable people whose deaths, beginning in 1851, went unreported in The Times.

When Cordell Jackson’s long and mostly obscure musical career intersected briefly with American pop culture in the early 1990s (coinciding with her appearance in a popular beer commercial, in which she showed the guitarist Brian Setzer a few tricks), it was almost as if she had stepped out of a dream: grandma, resplendent in a shiny ball gown and bouffant, peering through her old-lady glasses while ferociously rocking out on a cherry red electric guitar, amp cranked up to 10.