Anyway, I guess zoomer writers like K-pop so they're doing K-pop? And just ignoring that the Klingons already have some well-established music of their own... and by even the silly logic of the subspace resonator musical generator there would be no reason for them to do something irrelevant to their culture. If they wanted it to make sense, and it's Star Trek, not Space Magic Fantasy Hour, so it should make an effort to make sense.. they could have had the anomaly ingest the computer's musical archives or something... or have something about Klingons salvaging K-pop from a destroyed ship during the war and thinking "holy shit this is amazing" (I'm not endorsing either of these things, just pointing out that it's not that hard to get there within the confines of the actual sci-fi universe we're dealing with)
The Klingons should have been singing in Klingon, subtitled, like warriors, about a glorious quest of destroying the anomaly.