Until last fall, G. Brown was the city's most prominent music critic -- a staple in the Denver Post since the days when Boz Scaggs was a hitmaker, not a trivia question, and Yusuf Islam was still known as Cat Stevens. Not even an early-'90s suspension from the Post for essentially lifting the lead for a Keith Richards review from an item in Rolling Stone could knock him off his perch. Then, last October, Brown wrote a preview of a Simon & Garfunkel appearance so littered with appropriations from other sources that a Post investigation didn't even find them all. Brown characterized these borrowings as boo-boos, not chronic plagiarism, but resigned anyway in favor of a DJ gig at KCUV. The station's website, www.kcuvradio.com, includes a section called "What Can G. Brown Do For You?" that's loaded with past Brown articles, none of which are attributed to the Post or any other publication. 'Cause they can't make him resign again.