http://www.youtube.com/watch?v=UeXG2QrN8nI I'm a sucker for harmony and a good melody, so by a minute into hearing "Boundary Road" I immediately put All My Exes Live In Texas on my SXSW calendar. What's funny is that, despite their namesake, Elana Stone, Katie Wighton, Hannah Crofts and Georgia Mooney are from Australia, not Austin, though their country flair clearly has its roots south of the Mason-Dixon. The four have even taken the guitar pop of fellow countrymen Tame Impala covering their hit "Eventually" and sweetened it with accordion, mandolin, ukulele, acoustic guitar and those voices. You'll hear this combination clearly on "Boundary Road," which we're premiering today. The song addresses the societal pressure of keeping your emotions together, of being a role model, of not falling apart. Singer and guitarist Katie Wighton told me the origins of the song in an email — it all began simply enough, at breakfast with her "mum." "Something happened and all of a sudden we were