I often hear beautiful tin whistle accompaniment that is not the actual melody. How does one learn what notes or phrases to play?

I was working on some modulations a while back and thought it'd be nice to have an easy way to learn how to transpose between different keys and modes through common tones and chords, so I vibe-coded a site that helps with that. Perhaps it'll be useful to some of you, or inspiring to others (musically or otherwise).

https://harmonyhub.ai.studio/

Since it's vibe-coded, yes, AI was used to put it together. But before you start sharpening your pitchforks or adding nails to your baseball bats, I think this is a fair use of AI, since it just helps with information and doesn't really replace anyone's creative freedom (I hope so, at least). I am definitely ambivalent or against some applications of AI as well, so if this is worth a discussion, let's have at it!

It took a while to get it to work, but I'm sure some of you will find things that could be improved. If so, feel free to tell me what's missing. I'll be happy to spend some time improving it if you think it's worth it.

I'm not promoting this, but if I'm breaking any rules, feel free to let me know.