"Open Up" is a song by British electronic duo Leftfield featuring John Lydon (of Sex Pistols and Public Image Ltd.).

He has discovered a lower register to offset his nasal bark; this, and LeftField's clattering technomatic beat make him sound positively sinister.

"[9] Pan-European magazine Music & Media commented, "It's surprising to hear what Johnny Rotten can do to a '90s dance track, and impressive too.

"[10] Andy Beevers from Music Week rated it four out of five, adding, "The end result actually lives up to the hype, with Lydon's revitalised ranting carried along by a thumping trance production.

The combination of Leftfield's deep, dubby rhythms and John Lydon's unique, crazed vocals is awesome.