I maintain a large (600+ song) playlist of folk music on Spotify. There's a wide plethora of Irish, Scottish, English and Welsh folk music on there. Suddenly over the last few days, dozens of the tracks have disappeared from Spotify and are showing as greyed out in the playlist. Clicking through to the profile pages of the artists affected, I see that loads of them have had multiple albums removed from Spotify. Martin Simpson's classic "The Bramble Briar" is gone. Most of Martin Carthy's discography is gone. All of Fernhill's albums but one have disappeared. It's quite devastating and seems to have affected mainly folk artists - I don't see the same thing with other kinds of artists. Is it possible that there's some kind of licensing dispute or snafu that's affecting mainly folk/independent artists?