[alastairp]

Do you mean if the song has a vocalist singing? At the Music Technology Group (https://www.upf.edu/web/mtg) we have some classifiers that do something similar there are some demos at https://replicate.com/mtg/music-classifiers, see the output of the "voice_instrumental" classifier. This is built with a dataset of examples of instrumental songs and songs with singing in them. Normally classifiers are trained on timbre of the song to identify this. Earlier versions of this classifier are also available at AcousticBrainz: https://acousticbrainz.org/

[marstall]

thanks for pointing me to that. avant is powered by musicbrainz actually - so I will look to see what I can pull from acousticbrainz!