Now that the FFXV crossover event has returned, I'd like to take the chance to petition SE to change the mount music from 'A Quick Pit Stop' to 'Valse di Fantastica'.
It makes more sense for the car to play the FFXV overworld music, especially since all 4 people riding it have to either listen or turn off mount music. None of my friends like the harmonica and I'm pretty sure most people would agree that Valse di Fantastica is the superior orchestrion.