'lectricity Blues - Key of D. Rock & Soul Blues like this was defined in the late 1960s and early 1970s by people like Lowell George and Little Feat, Ry Cooder, Bonnie Raitt, Rolling Stones, Mike Bloomfield and many others. 'lectricity Blues is influenced by many artists from that time. The slide guitar is tuned in open D (DADF#AD).