I don't have a phone, but I do have an mp3 player, and am likely to hit shuffle on such a trip. If you were in the car with me you would hear a lot of Led Zeppelin, Santana, Rush, Triumph, Journey, Van Halen, Fleetwood Mac, Boston, Iron Maiden, Judas Priest, The Eagles, Guns and Roses, Heart, Garbage, The Who, some 80's metal, and more that just aren't coming to mind. Styx and Supertramp. Mostly rock, some R&B, some punk.
Or you might also hear classical, Beethoven and Bach obviously, but also Pagani, Holst, Wagner and Debussy, among others.