Below are some links which states that Puerto Ricans were involved in the Hip Hop movement:
The first video starts to get laggy a little. If this happens to you forward it to 1:47 The first video its just an introduction to the other videos. It talks about salsa (mambo) music on how it led to Hip Hop. If you find this video boring, please make that you check from mambo to hip hop part 4, 5, 6 which I feel are the most important videos.
Below are some pioneers that help to give birth as to what we know as DJing:
If you got more stuff to add to the list let me know thank you.
Great Hip Hop songs: