In my Model 3 I mostly listen to music from the phone over Bluetooth. The Bluetooth interface is rather rudimentary. You don't see progress of tracks you are playing (like you see with Slacker), and you can't select playlists and tracks from the UI. The latest update (2018.18) seems to give us the ability to switch sources more easily, which will be a big improvement. I wrote to Tesla about this today and received a response that they have passed it on to the right team to look into this. If you, like me, are a big user of Bluetooth on the phone and would like to see this improved, I suggest that you contact Tesla and let them know. One way to contact them is: Login to your Tesla account on a computer. Click Manage on your Model 3. Click Ask A Question and complete your question. There is a checkbox to Report to Tesla executive team -- up to you whether you want to choose it. There may be other ways to reach them as well. Given the large number of items they are working on, it is important that Tesla hears from users who care about this so they give it the appropriate priority.