I love rap and hip hop music. I love the beats and bass lines, and the rhythmic beatboxing.
I like a few songs, but not many. I find they use too much explicit language for my taste.
Hip hop is actually characterized by nine elements, but only four of them are considered most necessary to understand hip hop musically.
What kind of elements are those, I don't think I've heard that before.
It is not just music, it is a subculture and art movement. There is a lot more to it than the vulgar lyrics. 
Oh I'm sure it is, but why do they need to use that kind of language to express themselves?
Hip hop music
Hip hop music, also called hip-hop or rap music, is a music genre developed in the United States by inner-city African Americans and Latino Americans in the Bronx borough of New York City in the 1970s. It consists of a stylized rhythmic music that commonly accompanies rapping, a rhythmic and rhyming speech that is chanted. It developed as part of hip hop culture, a subculture defined by four key stylistic elements: MCing/rapping, DJing/scratching with turntables, break dancing, and
graffiti writing. Other elements include sampling beats or bass lines from records (or synthesized beats and sounds), and rhythmic beatboxing. While often used to refer solely to rapping, "hip hop" more properly denotes the practice of the entire subculture. The term "hip hop music" is sometimes used synonymously with the term "rap music", though rapping is not a required component of hip hop music; the genre may also incorporate other elements of hip hop culture, including DJing, turntablism, scratching, beatboxing,