The band were performing at the Troubadour last week when they played ‘What’s My Age Again?’ at the end of their set – watch footage above.
Morello also covered Bruce Springsteen’s ‘Ghost Of Tom Joad’ during the 14-song set and gave a helping hand on Mumfords tracks ‘Awake My Soul’ and ‘Dust Bowl Dance’.
The band played a host of hits from their back catalogue including ‘I Will Wait’, ‘The Cave’ and ‘Little Lion Man’ alongside tracks from their new album ‘Wilder Mind’.
The band are set to headline the Reading And Leeds Festival later this week (August 28-30).
Meanwhile, it was recently reported that Marcus Mumford has been making hip-hop music with producer 88-Keys.
The producer told NME: “I got an email from a really good friend of mine called Izzy [Izvor Zivkovic], who also manages my best friend Kanye West. He told me Marcus [Mumford] is part of the band Mumford & Sons. I’ve always seen their name around but I’ve never actually listened to any of their music, only because I’m really tuned out of pretty much anything current, music wise.”
The British band released ‘Wilder Mind’ in May, topping both the UK and US Album Charts. Partly recorded with The National‘s Aaron Dessner, the LP saw a departure from the band’s signature acoustic sound, with their use of banjos replaced with more electric guitar.