The collaboration is taken from Florence Welch and co's forthcoming 'MTV Unplugged' live album
The band's Royal Albert Hall show on April 3 will be broadcast via YouTube
Florence Welch says she was inspired by Charlize Theron's 'Queen Ravenna' character on new track
Singer beats off competition from Debbie Harry, Karen O and PJ Harvey
Singer also says she doesn't believe she was 'a fully formed artist' when she recorded 'Lungs'
Singer says it's 'good to be going back' this summer
Jamie Campbell-Bower stars alongside the singer in dark new promo
Acoustic performance includes a duet with Queens Of The Stone Age's Josh Homme
Singer says she's 'really happy' after taking home two gongs