every step a deliberate expression crafted by celebrity choreographer james alsop. >> it's such a criticalire country. and i don't understand why there isn't a bigger conversation. and maybe we're getting drowned in language. when he said he wanted it to be a dance-driven theme i was like, yes! we get to speak through our bodies. >> artistically trying to get a message across like this in choreography, how do you do that? >> i let the music and the song and the message dictate the movement. just so that it comes off authentically. >> reporter: known for working with the likes of beyonce and j. lo, this was her first time working with this many kids. >> it was beautiful. once i got in i was so nervous. because kids don't hold back. so i started teaching the choreography. they were sponges. they soaked it up. every word, every move, every direction. it couldn't have been better. it was borderline perfection. >> reporter: perfection? i had to see for myself. so we headed to the studio where these kids rehearse every saturday. we're in harlem right now at the national dance institute. these ki