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Stem Separation Got Good. Now What?

Dana Okoro · 20 Aug 2026 · 7 min read

Source separation quality crossed a threshold this year. The interesting questions are no longer technical.

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The models work. A four-stem separation of a dense mix is now clean enough for professional remix work in most cases.

What changed Better training data and higher-resolution spectrogram masking, mostly.

Where it still fails Heavily bussed material, mono-summed masters and anything with extreme parallel compression.

The real question Rights. Separation quality has outrun the licensing conversation by several years.

Dana writes about the economics of independent music and previously worked in streaming analytics.

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