funkwhale/api/funkwhale_api/providers/urls.py

from django.conf.urls import include, url
from funkwhale_api.music import views

urlpatterns = [
    url(r'^youtube/', include(
        ('funkwhale_api.providers.youtube.urls', 'youtube'),
        namespace='youtube')),
    url(r'^musicbrainz/', include(
        ('funkwhale_api.musicbrainz.urls', 'musicbrainz'),
        namespace='musicbrainz')),
]