Disturbed, Breaking Benjamin and Alter Bridge are on tour together and Disturbed’s David Draiman shared the stage with their peers. David helped out Breaking Benjamin with a cover of Pantera’s ‘Walk’ and then Myles Kennedy provided some vocal support to DIsturbed’s version of ‘Sound Of Silence”.  (Audio isn’t the greatest as it was shot by a fan).

https://youtu.be/_snqiy0GiNs