To say that Courtney Barnett’s star is rising might be an understatement. Only a year ago, the now 26-year old singer and guitarist from Melbourne, Australia was playing DC9 when she came to Washington, DC – a venue that, even packed, only holds a couple hundred people. In October, she sold out the Black Cat (capacity 700), but as a co-headliner with the also popular San Fermin. This past weekend, though, she and her band (which she refers to as CB3, for the trio of Barnett, Bones Sloane on bass, and Dave Mudie on drums) played back-to-back sold out nights at the 9:30 Club (capacity 1,200) to a crowd that was there all for her. Her audience in DC has grown by a factor of at least twelve in just over a year’s time (and that’s not counting those who were shut out after the last tickets were sold).