Hang on, let me get this right. There's another thread about the HOBER webcast, saying that it features quite a lot of Mudcatters like Art. So are you saying if

1) Art, or Scorcha or some other Mudcatter writes a song or performs some public domain folk

2) you jointly agree to broadcast it on a webcast which you set up using your equipment

then CARP is saying you have to pay them?

And what happens if you politely decline?