The finale of a day celebrating the 5th birthday of the Powerhouse Discovery Centre in Castle Hill, NSW. A 'spectacle' was composed and conducted by Michael Atherton - for Harleys, opera voices, narrator, multiple drumkits, beatboxer, rapper and synthezisers. (See also, Utility Horn Groove, Aurora Festival, 2008, youtube.com/watch?v=UBzhfmZOTUc). Video footage by the TMA agency. Editing by Michael Atherton.