Music genres are not disjoint discrete sets, they are multidimensional continuum. Typical Chinese approach songs through the lyrics, and searching for the "meaning." It is almost like taking "文以载道" approach to music. I guess that is your perspective when you think of rock music, or "Chinese Rock." The problem is, if we only consider the lyrics and its meaning, we are omitting the whole technical aspect of music including it progression, music form, rhythmic structure and all these key elements of music. Beatles, Steeleheart, Scorpian, Bon Jovi, Eric Clapton, Led Zeppelin, Yes, ZZ tops, Van Helen, or even MJ, all these they don't always protest, many of their songs are quit frankly about women, love and many aspects.Yet there are many similarities and differences. Which cannot be simply classified by its lyrics, or even the instrument the use.