Songs for long car rides should be longer than average pop song. At least, that's what I say now.
How long should they be?
("This is the song that never ends....")
It goes on and on, my friends...
TRUE STORY: Many years ago, I saw some CDi (?) Shari Lewis Lambchop "multimedia" product and I immediately purchased it.
I always thought I'd get, or meet someone, with a CDi...and I thought it would be awesome if a never-ending song was programmed for real (infinite loop, like A-B repeat on CD player, or a single groove at the end of a record that keeps playing forever, or an eight-track, but...)
There's something more magical about physical media looping forever, since getting stuck in an infinite loop in code is usually an error and not an accomplishment.