From the article:
> Stem Splitting: This allows one to take an existing song, and split the audio into distinct tracks, such as vocals, guitar, drums and bass. Demucs by Meta is an AI model for stem splitting.
+1 for Demucs (free and open source).
Our band went back and used Demucs-GUI on a bunch of our really old pre-DAW stuff - all we had was the final WAVs and it did a really good job splitting out drums, piano, bass, vocals, etc. with the htdemucs_6s model. There was some slight bleed between some of the stems but other than that it was seamless.