Gang of Four’s tour that brought them to the 9:30 Club on Wednesday night is less of a proper reunion than a logical extension thereof. Unlike their last visit in 2005, only singer Jon King and guitarist Andy Gill remained from the original lineup — garnering more than one “Gang of Two” comment from the audience. Interestingly enough, the current lineup of Gang of Four has released a new album, Content, the first release under the Gang of Four moniker since 1995. A quick glance at the audience revealed some folks that are more recent converts to Entertainment!-era songs, but a larger percentage that probably caught the band during their heyday and therefore may well have been anxious to hear songs from an album whose fair-to-middling reviews certainly exceeded anything else Gang of Four had released after 1982.