Twig loop on nested list

Hey everyone how would I run a loop on a nested list? For example, lets say I have a parent categories for music genre like "Rock & Roll" , "Country", etc... and then underneath each of those would be artist?

Nest the loops:

{% for data as genre %}
  {% for genre as subgenre %}
    {% for subgrense as artist %}
      {{ artist.name }}
    {% endfor %}
  {% endfor %}
{% endfor %}

Thanks OleVik!

When I first started to work through this I only had 2 "for" loops but it turned out I needed 3 like what you have here. Worked like a charm, thanks!