Hello Brian,
Good luck with the training! I could go on and on about favorite music as love to listen, especially when I'm running. For me, your key word is motivational - what motivates me is hearing stuff from the last 30+ years I've loved listening to. Reminds me of certain times and occasions or just simply listening to great bands and singers.
Have a go at creating a playlist of stuff you like, don't be shy about the cheesy stuff. Simply Reds "look at you now" is on mine
- I'm not a fan but it was on my main ipod which I used when my running one was charging up. And it did make me smile! Just the title lyric mind! Made me think "yep, look at how I have come on in my last year of running." From 5k to marathon and now starting training for an ultra. Got a good tempo too!
But - would also suggest you get used to running without as most races wont allow MP3s (quite rightly to be fair.)
Just for the record, Happy Mondays, Joy Division, Prodigy, Nick Drake, Ghostpoet and Alt J figure lots at the moment, and John Cooper Clarke always makes me smile!