I can access the tags taxonomy with {{ .Site.Taxonomies.tags }}, but how can I access others?
I’ve tried {{ .Site.Taxonomies.movies/years }} but obviously it doesn’t work.
I am not saying that you can’t have taxonomies with slashes in their names (I don’t know that), but I think it’s a bad idea. A slash is a folder-separation thing. So, basically, you would have to backslash the hell out of it to make it disappear in folder structures, and that is always a sign of an issue down the road.
I did not spend time to try this out, but try the following (just typed it, not tested):
{{ range $index, $slug: .Site.Taxonomies }}
<ul>
<li>index: {{ $index }}
<li>slug: {{ $slug }}
</ul>
{{ end }}
that might show your “weird” taxonomies. I think they might end up as for instance music\\/authors. Or even something weirder. If they don’t show up at all take it as a sign that slashes in taxonomy titles are not allowed.
Do yourself a favor and rename your taxonomies to something like music_authors,music_genres, etc.
You probably did this because you might have not known that you could add the following to your content in for instance content/music_authors/authorname/_index.md:
---
title: music/authors/authorname
---
and in content/music_authors/_index.md:
---
title: music/authors
---
This way your taxonomies can have whatever name you want them to have, while keeping things simple for your layout files.