On August 11, 1973, Clive Campbell aka DJ Kool Herc spun the turntables at a back-to-school birthday party for his sister Cindy Campbell held in the recreation center at 1520 Sedgwick. He was assisted by Theodore Puccio who has been credited as the first MC but many insiders attribute that honor to Coke La Rock. After spending months perfecting a new technique involving "playing the frantic grooves at the beginning or in the middle of the song" with two turntables, a mixer, and two copies of the same record, Campbell unveiled the technique at his sister's party.  After renting the recreation room for 25 dollars, Cindy charged 25 cents for females and 50 cents for males to attend. "I wrote out the invites on index cards, so all Herc had to do was show up. With the party set from 9 p.m. to 4 a.m., our mom served snacks and dad picked up the sodas and beer from a local beverage warehouse." With the exhibition of his new style, Campbell's friend Coke La Rock demonstrated another innovation called rapping. Attendees, or people who later falsely claimed to be there, include Grandmaster Caz, leader of the Cold Crush Brothers, Grandmaster Flash, Busy Bee, Afrika Bambaataa, Sheri Sher, Mean Gene, Kool DJ Red Alert, and KRS-One.