Fortunately @PJ-Bassist and @Reggaebass have covered some of my big big influences in RATM and Bob, so I am going for.
Kings X - so much Rock and grunge etc has comes from their influence without them hitting the heights, as well as bass and guitar tone for days
Boney M - Guilty pleasure (just like @51m0n) but Night Flight to Venus is a stand out album, they are pop and disco and showmanship in a nutshell - love them.
Muddy Waters/Mississippi John Hurt - you cant argue with those boys
DJ Premier - this is a wildcard as he is one of the foremost producers out there and not just hip hop, but his beats were always on point.
Only 3 is very very hard