Raven's vocalist canceled the tour due to brain surgery: details.

The heavy metal band from Great Britain decided to cancel their European tour due to health problems with their frontman.Raven, founded in Newcastle in 1974, is known for the hit 'On and On' and has 15 studio albums.'The heavy metal band had to cancel the European tour,' said Raven's frontman John Gallagher, who is 66 years old and currently recovering from brain surgery.The band wished their leader a speedy recovery and promises to come back even stronger. Raven has already established itself as one of the leading bands in the thrash metal genre and performed in the first national Metallica tour in 1983. However, this medical emergency is not the first health issue the band has faced, as in 2001 a wall collapsed on guitarist Mark, leading to a lengthy break in the band's tour.