RNRHS has been on a roll lately with Chapel Hill music royalty (if I do say so myself)–John Plymale, founding member of Chapel Hill bands The Pressure Boys and The Sex Police, now in the mix. The Pressure Boys were before my time, but I saw the Sex Police many times–I was even their booking agent for a while. John’s stage presence is almost superhuman and difficult to fathom if you only know him as laid back and unassuming John.  He’s quite the opposite behind the mic, sort…