There's dance practices. Although most aren't really "practice" since they're so polished. It's more like a performance video but in casual clothes.
What about vocals? Wouldn't it be interesting to watch vocal training, how they assign parts, record the song, etc.?
Kind of like this video where Mamamoo were practicing their high notes and harmonies. It took some time to get it right but seeing them succeed is satisfying.
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Those parts in the final performance (2:17 and 4:27)
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