In the audio series portion of “The 1619 Project,” New York Times cultural critic Wesley Morris says that when he hears American pop music—jazz, R&B, soul, funk, disco, even yacht rock—he hears Blackness. Likewise (and inseparably) is American social Black dance, emerging and evolving alongside these genres: bodies unstoppably moved by syncopation and harmony, shot through with ripples of delight only a perfectly landed improvisation can provide. But improvisation lives in the new. And as Black artists push forms and culture forward, older styles can get left behind….