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WMMR is an active rock radio station in Philadelphia, Pennsylvania, broadcasting at 93.3 MHz FM. The station is owned by Greater Media. Philadelphia's radio market is ranked the seventh largest in the United States by Arbitron's ranking system, and WMMR was the leading rock format station in the market, with a market share of 4.9, in August 2008.[1] Since Philadelphia is now the eighth-largest radio market since 2009, it is the second-largest active rock station to date after Atlanta's WKLS-FM.