Hi +Michael Alperstein
The way people find our community and other communities is, they go onto the section 'Communities' then look for the search bar and search for Music, My community should be the first one with the globe with the headphones on.
The way that I suggest you grow a community is that you share it to other 'Big' communities like 'Joke Of the Day' or 'Sports' and see if people join your community after then.
Our community does not have a website it is only for Music lovers on Google+, but having a Google+ Community or Page would help your website a lot.
I hope that this helps,