iTunes, QLab and OSC to Element from same computer= open network?

Well, one purely technical solution would be to add a second network interface to the Mac: that way one NIC is for the lighting network and one is for the internet. A better solution, though, would be to only play music that is stored locally on the Mac so that an internet connection is not required. That's better from a reliability standpoint, and it eliminates the inherent dangers of connecting a performance-critical device to the public internet.

Another potential issue is not technical, but legal: I suspect a standard Apple Music subscription does not include performance rights for the music, so it would be problematic from a copyright standpoint to play music from that service for the public. Acquiring royalty free music, or using music for which you have the appropriate license eliminates the copyright issue and also fixes the technical problem of being dependent on an internet-based content provider.

(Of course, I am not a lawyer and this comment is not intended as legal advice.)

Well, one purely technical solution would be to add a second network interface to the Mac: that way one NIC is for the lighting network and one is for the internet. A better solution, though, would be to only play music that is stored locally on the Mac so that an internet connection is not required. That's better from a reliability standpoint, and it eliminates the inherent dangers of connecting a performance-critical device to the public internet.

Another potential issue is not technical, but legal: I suspect a standard Apple Music subscription does not include performance rights for the music, so it would be problematic from a copyright standpoint to play music from that service for the public. Acquiring royalty free music, or using music for which you have the appropriate license eliminates the copyright issue and also fixes the technical problem of being dependent on an internet-based content provider.

(Of course, I am not a lawyer and this comment is not intended as legal advice.)

Using wifi for the internet and LAN for EOS worked like a champ. Thanks for the help with this workaround.

As for the other-- is you are paying ASCAP blanket license, does ASCAP actually care if you play off of a CD or off of a streaming service, if the same waveform reaches the ears of the audience? That seems ridiculous, but alas, I too am no lawyer... Clearly the apple service ALONE does not constitute as ASCAP/BMI/SESAC license for playing the music...

Still not a lawyer, and not qualified to answer this fully... but the risk here would be that an ASCAP blanket license only covers the specific music that ASCAP represents. There will almost certainly be music in the Apple library that is either covered by BMI instead, or is independent. Determining proper licensing for a randomized playlist can be a very difficult task.