It is definitely horrible stuff. (Para. 2)
Meaning: The music is certainly very bad.
definitely: ad. certainly, with no doubt
Without enough teachers the education in this area is definitely a problem; no one can argue that it is not serious. 没有足够的师资，这个地区的教育肯定成问题，没有人能否认这个问题的严重性。
horrible: a. awful, unpleasant
What a horrible mistake you've made! 你犯了个多么可怕的错误！