From "The Stories Behind Every Grateful Dead Song 1965-1995" I read the following today (on p.190... regarding the "In The Dark" years - in the paragraph following the Ben & Jerry info).
Air Garcia also enjoyed another heady commercial flight thanks to denim magnate Levi's, which featured the chunky, aging axeman jamming with old bluegrass buddies Sandy Rothman, David Nelson and John Kahn in a 30-second 1987 radio commercial that the Dead had turned down. "A good pair of Levi's are bound to set me free," Garcia proclaimed earnestly for the sake of the hard sell, "501 blues, shrink to fit only me.
