Would you like to explain the answer no.11?
I think No.11 need filling with "the" article, because it is the typical music. But the key is no article. I am confused
(s)............ name of the band was changed to The Beatles and it became one of (9)............ most commercially successful and critically acclaimed acts in (10)............ history of (11)..............popular music. They built their reputation playing clubs in (12)............ Liverpool and (13)..............Hamburg in (14)............ Germany over a three-year period from 1960.