Some fans thought they may have been the band that Sharon Osbourne booted from the star-studded line-up
"We raised a ton of money for a great cause and so many great musicians & bands & fans all over the world paid tribute to the ALL TIME greats," Tom Morello wrote on social media
“I wept silently as my heroes fell on their wizardly, mythic sword to bid us farewell”
"Thank you from the bottom of our hearts"
The band were reportedly practising a rendition of one of the metal pioneers’ hits before one of their live shows
The guitarist also admitted that he is experiencing nerves before tomorrow’s massive gig
The star-studded metal show is set to be held in their Birmingham hometown this weekend
The album will be made up of demos recorded by the group in 1969
Their huge farewell concert, dubbed ‘Back To The Beginning’, will be held at Villa Park in Birmingham on Saturday (July 5)
The star-studded metal event takes place next month