Have singers Dee Dee Ramone and Rod Evans both been members of a band?
Dee Dee Ramone: Douglas Glenn Colvin (September 18, 1951 – June 5, 2002), known professionally as Dee Dee Ramone, was a German-American musician, singer and songwriter best known as founding member, songwriter, bassist and occasional lead vocalist for the punk rock band the Ramones. Rod Evans:  In the late 1960s he began his professional career in The Maze, formerly MI5, after which he was a member of the original Deep Purple line-up who produced three studio albums with a more progressive and pop driven sound.
yes