[cannam]

> I think that's probably what chordify.com does [...] I don't think they are using chordino

I think they were initially using the Chordino chroma features (NNLS-Chroma) but a different chord language model "front end". Their page at https://chordify.net/pages/technology-algorithm-explained/ seems to imply they've since switched to a deep learning model (not surprisingly)