My advise is to get a Spotify (paid account, its like Netflix you can share a few with your family and friends). Than create all the playlists you like. Over time you should have a good amount of streaming music. When you are at home or on a wi-fi connection, you can download the playlists you create to your phone and store the music as if it’s your own. The beauty here is you don’t need cell phone coverage for you to be able to stream your (their) music like free pandora Spotify Sirius / xm.
deicide what you want your intercom for. I mean if you want to pair your phone with it to accept phone calls on a ride or if you are tip toeing around other campers and can’t resist the temptation to wait until you get out to crank up the tunes on a separate stand alone system, than I can see the sense in pairing your phone (music device) to your intercom.
once you have a stereo system, chances are you’ll use that for your music listening over your intercom.
only reason I mention it, is because you never know what your phone will pair to first (intercom or stereo) especially if you are not tech savvy, or are that guy that always leaves your Bluetooth and wi-fi settings on on your cell phone.
anyhow if you have a separate stereo system like a soundbar or Rockford Fosgate setup. You will no longer listen to music though your head sets. But a good sound system will still be loud enough to be heard over your exhaust, Engine, and helmet covering your ears.
highly doubtful it will drown out your wife yelling at you to slow down in your headset but that’s what volume on your intercom is for or you can simply not connect her helmet jack all the way