That sounds like an incredible experience! I started running late in life and went couch to 50K in about a year. Going straight to endurance meant that I didn’t develop speed so I doubt I could keep up with your friend for more than 5 meters.
I need to write my introduction post (once I get a proof-of-life photo) that will give more details. I started running at the same time as you. I had tried a few times before but it never stuck. I hated it. In fact, it was purely accidental that I became a runner. I decided to get into shape and running was something I could do. I hated every step for 3 solid months. A friend recommended BtR so I read it and loved it.
One morning I decided to try a trail I had heard about. People joke about it in LA. I struggled on the hill. When I was ready to turn around I thought “what would the Tarahumara do?” I smiled, started running and have t stopped.
As for music, I listen to music sometimes but often listen to nature or the city around me. Lately I’ve been listening to keto or running science podcasts. I’ve never had patience for podcasts and find ones that are rich in information are interesting. We'll see how long that lasts.
RE: How to tap into flow state when you run