Jake Gyllenhaall and Winston Marshall of Mumford &amp; Sons enjoy &lt;a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=The+Avett+Brothers&amp;family=editorial&amp;specificpeople=4270503 ng-click='$event.stopPropagation()'&gt;The Avett Brothers&lt;/a&gt; during day 1 of the 2011 New Orleans Jazz &amp; Heritage Festival at the Fair Grounds Race Course on April 29, 2011 in New Orleans, Louisiana.