Rap has become the most-consumed music in America, according to industry data, but with its growth comes a new concern: a widening generation gap.

Just as rock ‘n‘ roll splintered in the 1970s when punk arrived, a beef between some young hip-hop artists and “dad rappers” is dividing fans. Some music insiders worry that the schism will hurt the unity of the hip-hop community when its music is at its cultural and commercial peak by splitting fans into opposing camps.

“Hip-hop is a culture, and all cultures, without exception, have traditions and norms,” says Tuma Basa, Spotify’s global head of hip-hop. “It can stop being a culture if some of its traditions and heritage is not—forget about acknowledged—even known.”

On one side are upstarts whose raw, genre-hopping music has been labeled “emo rap.” On the other are elder statesmen like Jay-Z, who cater to older fans in a youth-obsessed genre. Bridging the divide? Thirty-something stars like Kendrick Lamar and Nicki Minaj.

Below are five things to know about rap’s generation gap.