Reply To: Do you hold in acapella?

To what Rabbaim said above, I don’t think it’s only to keep the driver awake. There is an Issur of music year-round (O.C. 560, I believe). The Poskim there say that to be Mezarez Bim’lachto is muttar. I would assume the same here. Music should be okay so long as the only purpose is that the driver drives better with music, even if the driver doesn’t technically need it.