Unless is Negate, sufficient

Yes it is valid because "all" implies "most", and this would follow the formal argument structure of "two mosts"

There's a few problems with your argument.

1. "French people" describing a population and "France" describing a geographic location are not interchangeable. Just because most music found in France is electronic, it does not speak to the music preferences of French people.

2. Your argument structure is not valid.

Your argument structure:

F->M

M-Most->E

------------

F some E

To make this valid it would need to be

F->M

F-Most->E

-----------

M some E

Translated, that would be:

All French people like music

Most French people like electronic

Therefore, some people who enjoy music, enjoy electronic