On this day in music history: August 11, 1973 – Eighteen year old Jamaican born DJ Kool Herc (aka Clive Campbell) throws a block party in the first floor rec room of his apartment building at 1520 Sedgwick Avenue in the Bronx in New York City. Advertised as a “Back To School Jam”, flyers handwritten on 3×5 index cards are distributed widely throughout the neighborhood. The event is filled to capacity, attracting 300 people. Herc sets up his powerful sound system in the room, spinning a mixture of R&B, Funk, Latin and Rock records. Using duplicate copies of the same record on two turntables, Herc isolates and extends the breakdown of these songs to the delight of the crowd. The event is a huge success and leads to the DJ spinning at even larger events on the streets and in clubs in and around the Bronx. However, the first party is regarded as a watershed event in history as the birth of the Hip Hop Movement. The strip of Sedwick Avenue where the apartment complex resides, is redubbed “Hip Hop Blvd.” by the city of New York in 2016, by mayor Bill de Blasio. The current owners of the building have applied for it to be added to the registry of historic sites in New York City in 2007, but to date has not been finalized. Happy 46th Birthday, Hip Hop!!!