When I ride my road bike, I listen to music on my phone (not earbuds, of course). For those interested, I recommend jazz like Art Pepper. It keeps your mind off the hard hills but doesn't distract enough to keep you from noticing potholes and rocks. My favorite Art Pepper album for riding is "Modern Art." On easy days I listen to Chet Baker.
I subscribe to Spotify, but free Spotify works too.
Surly rider here. Glad to see the thread!