SoundExchange is suing Sonos for about $3.4 million in unpaid royalties from Sonos Radio. A federal court in California has paused the case until the Second Circuit decides whether SoundExchange has the right to sue services that don't pay, in an appeal against SiriusXM argued on September 25 with no ruling yet. If SoundExchange loses, artists and labels could be left chasing underpaying services on their own, so we're asking our artists: are you registered with SoundExchange?