The Hirshhorn Museum and Sculpture Garden is one of the great treasures of Washington’s arts scene, a federal museum with the guts to undertake strange and current exhibitions, along with adventurous musical programs to accompany them. So it should be no surprise that DCist was at the Hirshhorn yesterday to hear what was sure to be an excellent and interesting concert by the Norwegian pianist Håkon Austbø. With a name spelled like that, how could…