Sociology in my opinion is absolutely fine to take so long as your other two subjects are strong.
Say for example, English Lit (Or language), History or Sociology makes sense. It's all essays, and they all work well together. Even a foreign language, psychology or another humanity could work.
But if say you took Photography, Music tech and sociology I would worry a little bit due to the subjects not leading into much other than their own subject areas at degree level.
I agree with all posts above.
I don't think sociology is bad at all so long as the other subjects are strong in combination (I'm not saying photography or music tech aren't strong, but in combination it doesn't do many favours)