It's literally a simple thing to prove.
It's not like video was barely invented in the 1960s lol. Shits been around since 1910s. Audio recordings was 1890s.
These groups that "we got it from" should EASILY be able to post ANYTHING that disputes this thread right?
True, and I am sure you will hear about the photographs taken by Joe Conzo Jr. Albeit, Mr. Conzo has some beautiful photos that are currently housed at Cornell University (they can be viewed online at their website).
However, most of his photos of rap artists were taken in the latter portion of the 1970s and early 1980s. The ironic part of this is that many of those photos were taken at my old High school, Norman Thomas H.S.
His collection doesn't have anything from 1970 - 1978, featuring the "jams" they used to have in the parks (usually school yard playgrounds).
It's important to note that these "impromptu" gatherings came about because a few guys in the neighborhood decided to bring their audio equipment outside. Therefore, there were no flyers like the one for an event at 1520 Sedgwick Avenue on August 11, 1973.
You see, the young men playing the music valued finding a lamppost with an outlet they could plug their equipment into more than a flyer.
They used to put the equipment in this area, and utilize one of the street lamps to the right side.