Watch the Funk In online guitar lesson by David Santos from 50 Bass Grooves You MUST Know
Here is a 2 measure phrase on a one chord vamp. This particular rhythm is very common in funky music. It's been around for a long time and I don't see it going away any time soon. The riff uses the root and the flat 7th and the root. The rhythm of the line is stated in three phrases. Keep an ear open for the only low E in the tune and try and grab it with me.