I tried the open source one that Spotify published a while ago on jazz trio music (just piano, double bass and drums) but it was pretty useless. My experiments with the trials of some commercial services, where you select an instrument and it extracts just that were much better.
If the piano is a Rhodes then extracting electric guitar works well, extracting a piano not at all.
If the piano is a Rhodes then extracting electric guitar works well, extracting a piano not at all.