Regarding the technical writing aspects of the paper, I have to agree with MartialIntent in that you used a heavy reliance on quotation, where you might have more effectively put the information into your own words while giving credit to your sources. Also, check your writing manuals, I believe that lengthy quotes should be offset as their own paragraph, slightly indented.
As far as the content of the paper, you have picked a very difficult topic and you deserve a pat on the back for taking up the challenge. In all honesty, this is a topic that could become a PhD Dissertation. Until just recently, there have been few written sources in English about capoeira, and by extension the berimbau and atabaque, so unless you read Portuguese you can find yourself limited. More recently a few more works have been published, some of which have been of a higher quality of scholarship than many of the previous works. I would suggest you get a copy of Capoeira: The Jogo de Angola From Luanda to Cyberspace, by Gerard Taylor. So far only Volume One of Two is available, but I have found this book to be by far the most informative, as well as the most ambitious work in tackling the highly convoluted and confusing history of Africa and Brazil that meshed to create capoeira. This book also makes it very clear how difficult this research is, trying to make sense of what was happening in Africa and Brazil that lead to modern capoeira and the development of all aspects of the music that has become part of it. His research into Africa goes back as far as the time of the crusades, if I remember correctly.
Also, as MartialIntent mentioned, active training with a capoeira school would go a long way in developing your understanding of the music of capoeira, and this alone would give you more confidence in your own insights and lessen your need to rely on quotations of others. However, competent capoeira teachers outside Brazil are still somewhat few and far between, so if this is not available to you, I certainly understand.
Regarding the historical developement of capoeira, most teachers today can give you the most recent and modern history, say from the time of Mestre Bimba in the 1930s to the present. What many of them won't be able to tell you is the history prior to this, as well as the parallel history of capoeira that did not include Mestre Bimba even tho these events were taking place at the same time. Mestre Bimba was a very influential figure in modern capoeira, but he was by no means the only influential individual. Others of his contemporaries, like Mestre Pastinha as well as many unknowns, also had a hand in developing capoeira, so the lineage that traces thru Mestre Bimba is only one aspect of the whole picture. I believe the reason many teachers, including those from Brazil who have trained for many years, cannot relate this history is because it has been largely an oral history and much of it has been forgotten. This is why works like Gerard Taylor's are so important because his has really dug into the history to try to bring this forgotten information back before it is completely lost for good.
At any rate, I think you have given this a good effort and I applaud you for doing this. There is more to it however, and you could dig deeper and keep going if you are so inclined. Some of your ideas may be challenged by works like Mr. Taylor's. As an example, you state on the top of page 4 "This also gives light to another context of how Capoeria grew, hidden as a simple dance with extravagant techniques which the slaves freely practiced to attact customers and such, hidden within a devastating Martial Art exists." [emphasis added]. I think the truth is that capoeira, with other aspects of the African's culture in Brazil, was highly oppressed and not freely practiced, but rather done on the sly, or if done openly then it was an expression of defiance against the colonial Portuguese. Again, Mr. Taylor makes this picture quite clear.
Once again, I have to thank Arnisador for making me aware of Mr. Taylor's book a couple months back. I highly recommend the book, more so than any others I have read in English, to anyone who is interested in capoeira history.
I want to apologize for focusing most of my comments on Capoeira rather than the Berimbau and Atabaque specifically. The truth is, they are so closely intertwined that to discuss the one is to include the other. While Berimbau and Atabaque can also be found musically outside of Capoeira, once you present them within the framework of Capoeira, then they cannot be separated. A greater understanding of one is a greater understanding of the other.