... haven't found "music IN my ears" even in the cambridge dictionary website - is this expression colloquial? ...music TO my ears means anything that sounds good or pleasing, though
"Music in my ears" is an expression in English. If someone were to say to me "Your voice is worth a million dollars" now that woud be a 'music to my ears'.
Wow, that's really interesting. I am an Australian native English speaker and have never heard it. Where are you from?