Thanks to NikGreen who sends in this link to Rolling Stone magazine´s placement of Red in their 100 Greatest Songs list. Nik quotes the review thus -
"I’m not a blues guitarist," Robert Fripp said in 1995, "but I think I’ve met the spirit of the blues several times." This is one of them: blunt-instrument funk in which Fripp, leading a power-trio Crimson, jars the mathematical cadence of his riffing with a wrecking-ball swing and rude pig-squeal harmonics.
and adds
"Not just a wrecking ball! "Red" is hot in every respect ..there’s thermite in the mix somewhere."