He was joined by Sleep Token's II, Extreme's Nuno Bettencourt and Adam Wakeman of Ozzy Osbourne's band
Fender was due to headline the Belgian festival tonight (July 5) but dropped out after suffering a vocal haemorrhage
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 historic event takes place this Saturday (July 5)
"It’s a song we play at every show around the world that fans sing along to reinforcing their love as well for the legendary Prince Of Darkness!!"
Sabbath and Ozzy Osbourne's huge farewell concert takes place at Villa Park in Birmingham this weekend (July 5)
As many as 300,000 visitors are expected in Birmingham for a "super weekend"
The album will be made up of demos recorded by the group in 1969