My car doesn't have a CD player any more, but I still have a Minidisc player in the glove compartment with a maybe 20 discs that provide a guaranteed nostalgia trip (each disc has 20-50 songs with a very specific set of eigenvalues from back in the day). Also helps that the Minidisc player runs off a single AA, Sony built good stuff, I found it in storage after easily 10-15 years of its last use and it still played music off that one AA