Add separation and editing benchmark files

pieces/scns_eval_v3_140/README.md

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+# scns_eval_v3_140
+
+`mixture.wav` is the recording. `score.json` contains the aligned score for
+NoteSep inference. `occurrences.zip` contains the isolated note references;
+`piece.json` gives their timing, archive member names and source metadata.

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pieces/scns_eval_v3_141/README.md

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+# scns_eval_v3_141
+
+`mixture.wav` is the recording. `score.json` contains the aligned score for
+NoteSep inference. `occurrences.zip` contains the isolated note references;
+`piece.json` gives their timing, archive member names and source metadata.

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pieces/scns_eval_v3_142/README.md

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+# scns_eval_v3_142
+
+`mixture.wav` is the recording. `score.json` contains the aligned score for
+NoteSep inference. `occurrences.zip` contains the isolated note references;
+`piece.json` gives their timing, archive member names and source metadata.

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pieces/scns_eval_v3_143/README.md

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+`piece.json` gives their timing, archive member names and source metadata.

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pieces/scns_eval_v3_144/README.md

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+
+`mixture.wav` is the recording. `score.json` contains the aligned score for
+NoteSep inference. `occurrences.zip` contains the isolated note references;
+`piece.json` gives their timing, archive member names and source metadata.

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