Grateful Dead members have said that it was after attending a concert by the touring New York "folk-rock" band The Lovin' Spoonful that they decided to "go electric." Gradually, many of the East-Coast American folk musicians, formerly luminaries of the coffee-house scene, were moving in the electric direction.
It was natural for Jerry Garcia and Bob Weir, each of whom had been immersed in the American folk-music revival of the late 1950s and early '60s, to be open-minded toward electric guitars.
Weir, too, was not a traditional rhythm guitarist, but tended to play jazz-influenced, unique inversions at the upper end of the Dead's sound.