I am not really a fan of communities that are too general, like Music, as you will struggle to find the stuff you like. I have created some, like Drumming, that are more focused. The issue on Hive is that there are not always enough active people to make a specialised community really work, but even if it is just a few people for now you have something to build on.
I've not looked, but I expect FB may have groups dedicated to metal in Italian that can get hundreds of posts, but they have billions of users.
Recruiting new Hivers can be hard, but it is helpful to be able to point them at communities for their interests. I think the main aim should be to get people on board and work with them to build communities.
We have a few Italian musicians here already. I think that all languages should be represented.
!BEER
Music groups on FB are useless. I've been in dozens from all over the world. Groups with 1k and 100k people, they're all the same. Just a bunch of musicians sharing their own music, or music enthusiast sharing what they like, and none of them is getting even 1 like. The engagement there is below zero.
I've been in some for specific bands that are not too bad. Managing a huge group is not easy. We can explore new options here. If we could persuade a few communities to move over then it would make a big difference.
If you need accounts creating for people then I can help.