sonos owners - what are your favorite services you feed it?

i ditched pandora a decade ago; but it still likes to default to sonos-provided stations and amazon music.

my wife has apple music connected and i usually listen to my albums stored on my plex server since they are all lossless copies/FLAC.

i recently added mixcloud because of those great 80s dj mixes we posted awhile back.

what are some other good services (ad free preferably) that you use with sonos?