I'd suggest Apple's free Podcasts app. Podcasts are free, and there are SO many amazing high quality podcasts out there. I like to listen to them while I'm driving to work, on a lunch break, doing laundry, etc. My favorite podcast is "Hardcore History" by Dan Carlin. It's not some dry history lecture, it's pretty fascinating stuff. For someone who has never heard his podcasts before, I'd suggest starting with Show 41 "Thor's Angels", covers the post Roman collapse period. There is also a lot of NPR podcasts that are pretty good.