Most all worship "style" (not content) is culturally based. We often tend to equate our style preference with being the "biblical" way of doing it.
Did Paul not say in 1 Cor. 9:22:
". . . I am made all things to all men, that I might by all means save some.I am made all things to all men, that I might by all means save some." (KJV)
". . . I have become all things to all men so that by all possible means I might save some." (NIV)????
Also, Philippians 1:18 says:
"What then? notwithstanding, every way, whether in pretence, or in truth, Christ is preached; and I therein do rejoice, yea, and will rejoice." (KJV) and,
"But what does it matter? The important thing is that in every way, whether from false motives or true, Christ is preached. And because of this I rejoice." (NIV)
IMHO, Paul wold probably be supporting the "Hip-hop" approach.
Do I like the "hip-hop" style? no. Do I like "fragmenting" the body? Not really.
I do look at stlye as well a content when choosing a church. That's style in music as well as style in preaching and ministry. Two churches can be basically in content, yet very different in style o ministry, preacjhing and music. Each church, just like any individual, has a unique personality. Style and content are both expressions of this personality.
I'd like to recommend a book: "The Voice of Our COngregation: Seeking and Celebrating God's Song for Us" by Terry York and David Bolin. Its main premise is that each church its own unique voice for ministry and service to God. An excellent book for the study of worship and minstry context of the church.
To sum up my long post: If Christ is preached and people are comig to the Lord at a Hip-Hop, cowboy, liturgical, casual, Southern gospel, etc. church - May your tribe increase.