Parking lots may seem like less-than-ideal places for rock concerts, but when 1,500 bands converge on Austin at once for SXSW, every inch of ground counts. Today (March 13) Tegan and Sara opened their set outside of Austin's Waterloo Records with a performance of 'Back In Your Head,' a tune from their 2007 album 'The Con.'

Back in January, Tegan and Sara released 'Heartthrob,' their seventh album and first since 2009's 'Sainthood.' The record found the Canadian twins embracing a sound that harkened back to 1980s pop music. 'Heartthrob' debuted at No. 3 on the Billboard 200.