Extend your commute in that case, as and when, but not every day. Run the long way home, if it varies your route, from time to time as well.
Unless you are the kind of person who eats the exact same meals every week, goes to the same place on holiday for 30 years in a row and knows how many pieces of toilet paper you use, then you need variety.
This is the real silent killer, not heart disease.
Don't run the same distance for all your runs. Assuming you don't top yourself out of boredom, the variety will put different stresses your body (in a good way) and help you improve. For now, I would make one run longer than others, aka 'the long run' and if you want to stick with 4 days, make one other perhaps 2/3 as long as the long run. Keep the other two runs short. Later on, you'll want to include a tempo run each week, which will really help.
Good luck with your half.... if you're still around
Music is good as a distraction, such as on a long drive or if performing an undesirable task- housework, for example. I listened to the Kona IM Talk podcast when doing a 5 hour delivery today (postman) to break up the monotony.
But when doing something I enjoy, I want to experience it fully. Never even tried running with music and I never will. Why would you want to 'escape' your running? Is it not something you enjoy?