The hills around Denver, Colorado were alive with music, but not with the voices of the von Trapp family. This music emanates from the humming engines of Audi’s eighth version of their ‘B’ Segment lineup – the Audi A4, S4, A5, S5 and, again, the Audi allroad. For 2013, Audi reintroduces the allroad, last available in the US in 2005. This new version replaces the A4 Avant in Audi’s model line.