Here are the possible solutions for rock group whose members all assumed the same last name with the clue
Answer
Clue
Relevancy
ramones
Clue
Rock group whose members all assumed the same last name, with "the"
rivals
Clue
Two teams playing the same sport in the same league in the same town, most likely
oliverreed
Clue
Actor whose first name is the title of a Best Picture he co-starred in, and whose last name is that film's director
devo
Clue
Rock group whose members wear red flowerpots on their heads
Definition
(short for) devolution, as in devo max, an arrangement in which a central government transfers the maximum amount of authority to a regional government while still retaining sovereignty over it
ramone
Clue
Assumed family name in punk rock
nsync
Clue
Boy band whose name was derived from the members' last names
rockbottom
Clue
With 133, the name of the band whose members appear in the theme answers. (They disbanded in 2012 after raising millions for literacy, but they're reuniting this weekend for one last concert.)
thirteenolonies
Clue
Old group whose members are all represented in this puzzle