On my latest 19 miler, I did something I have never done before. I ran with music. There's pros and cons of doing this. Yes, time does seem to go by faster. No, situation awareness is not as acute so you must pay more attention to your surroundings. Since my music player is also my phone, I had the security of being able to call the wife unit or daughter unit for a rescue ride home if necessary. I could also stop by one or two Starbucks on my route and use my Sbux app. Neither was required.
I'm still still not convinced music is the thing to do. You do lose a little touch with nature. You also don't hear your breathing as well. I found myself going faster than I should on some of the faster songs.