A Girl I Once Knew Northern Uproar A Girl I Once Knew - Northern Uproar The intro riff is basically the G chord followed by a quick descending run on the 5th (A) string, which goes C, B, A and back to G. Something like this: {sot e|--3----------------------------------------------------------------------| B|--3----------------------------------------------------------------------| G|--- (x 4)----------------------------------------------------------------| D|--------------------------------- (guitaretab.com)