Oral argument audio recording from March 27, 2013. Via www.supremecourt.gov
Read more about the Defense of Marriage Act case here:
http://www.motherjones.com/politics/2012/11/supreme-court-same-sex-marriage-rights
And read more about the Supreme Court's oral arguments for the "Prop. 8" marriage equality case here:
http://www.motherjones.com/mojo/2013/03/supreme-court-proposition-8-audio