Hah.that happened in a dramatic and dire fashion when I took piano lessons, too...
This week it's as though all my students are allergic to F major. Poor little Bb keeps getting ignored.
I have also done that!
Guess it makes for a fresh/new sound! A student looked at me tonight & asked why his song sounded weird...said it was because he playing each hand in a different key!
So picky! Maybe he was being creative! :)
Yes, he had no idea he was channeling the Avent Garde composers!