See Simon’s face? He totally unexpected these random guys could sing like that! Stunning!

<p id="watch-headline-title" class="yt"><span id="eow-title" class="watch-title long-title yt-uix-expander-head" title="Collabro sing Stars from Les Mis&eacute;rables | Britain's Got Talent 2014" dir="ltr">Collabro sing Stars from Les Mis&eacute;rables | Britain's Got Talent 2014</span></p>