To make Extended Play, producer and DJ Statik Selektah put out the bat signal and more than 40 rappers turned up. They range from middle-aged, battle-scarred pros like Prodigy, Black Thought and Bun B (Raekwon calls them “the vets in the sweats”) to the next wave, like Flatbush Zombies, Troy Ave and Pro Era (Statik is also the group’s DJ). They showed because Statik is something special — he makes functional, real-deal records that sound like the triumphant persistence of New York, the strains of nostalgia in a sunny day, parents telling their kids to quit running around and be easy. Then he invites mentally tough, rigorous thinkers raised on competition to perform over them.