Streaming and social networks took music out of the hands of the country's cultural guardians and let a new generation of artists emerge. Ivan Nechepurenko of The New York Times reports.

On a recent Friday night, rapper Big Baby Tape rushed onstage at a packed club in this ancient town near Moscow to launch a 32-date tour.

The crowd, mostly teenagers, shouted his name ecstatically, jumping and bouncing off each other as the punchy, bass-heavy music began to play.

Just a year ago, Big Baby Tape was only known to rap aficionados. But in November, he released Dragonborn, his first

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