Music show: Sebastian Knauer, Alt-J, London Grammar & Camille

German pianist Sebastian Knauer pays tribute to one of the greatest composers of all time on his latest album "Bach & Sons 2". The record, a follow-up to 2011's "Bach & Sons", shines a spotlight on the works of the Bach musical dynasty, including the seldom-heard Triple Concerto BWV 1044. Plus, we listen to new releases from indie stars Alt-J, London Grammar and French chanteuse Camille.