Odd Japanese Musical Education

We learnt musical notes in English in elementary school.
ex: Do Re Mi....
However, if we want to learn music seriously,
we have to learn the musical notes in German and Japanese.
What's more, the words used on music sheets are usually Italian so we have to study Italian too.

There are some homonyms of musical notes between German and English
so when I talk about notes with English speakers, it sometimes makes me confused!