Frannie Kelley

This summer Nas is traveling the world performing his debut album, Illmatic, in full. The crowds coming out to see him — in Texas, Germany and California — are turning up because the 20-year-old record is an acknowledged classic.

In the early '90s hip-hop was just beginning its takeover of popular music. It was landing on the charts, but more often than not, the songs there were novelties (see: MC Hammer, Vanilla Ice).

For the people who took hip-hop seriously, and especially the fans in rap's hometown of New York City, this was a problem.

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AUDIE CORNISH, HOST:

Session musician Stephen Bruner has played bass in other people's bands for more than a decade. He can play metal, R&B, hip-hop, jazz. And he's been folding all that into his own music, which he puts out under the name Thundercat.

Now, with his second album, he's stepping to the front of the stage.