Corpora: hip hop

[Steve Renals]

OED online says

  orig. U.S.

  [f. hip, reduplicated with alteration of vowel as a jingling refrain
  (see quots. 19822, 1984), perh.  influenced by HIP a.; cf. BEBOP n.,
  HOP n.2]

  ...

  1982 N.Y. Times 3 Sept. C4/6 He [sc. D. J. Hollywood] phrased to the
  beat of a funk record and paced himself with a repeating refrain,
  usually..a variation on the nonsense formula `hip, hop,
  hip-hip-de-hop'.]

  1984 S. HAGER Hip Hop 109/2 Hip hopfunky music suitable for rapping; a
  collective term used to describe rap/graffiti/breaking/scratchin'. The
  term was invented by Starski, who used to chant: `To the hip hop, hip
  hop, don't stop that body rock.'