Question: Are Mike Ness and Oliver Sykes both lead vocalists of their bands?
Sentence (from "Social Distortion Winter 2012 Tour"): They also brought out Eric "Jailhouse Blues" Von Herzen who played harp for "It Coulda Been Me" and "Drug Train" on Social Distortion (album) and they also played ZZ Top's La Grange (song) with Billy Gibbons.
Relevant evidence: No