Romy Madley Croft (right) and her bandmates in English indie pop act The xx will be pumping their brand of alternative rock through the Kitec Star Hall on Wednesday. The band stemmed from the dynamic duo of Oliver Sim and Madley Croft, who started making music together in 2005, when they were 15. Guitarist Baria Qureshi joined them soon after and Jamie Smith a year later. The release of their self-titled debut album in 2009 saw them make the transition from indie darlings to must-see mainstreamers. In 2010, the BBC used the album’s opener, Intro, in its coverage of the British general election, which saw the formation of a coalition government headed by Conservative Party leader David Cameron …