Almost unlimited number of songs. I get complaints from passengers for doing just that in the car (for some reason they think I should pay more attention to them--now why would that be?). Best solution I've found is to have passengers who enjoy doing it as much.

Anyway, I'm with Joe Offer on this--love to sing falsetto in the car.

In fact, I owe my membership in any choral group at all to the car radio. I have a lousy range--one and half octaves--but with falsetto, it's doubled. Some guys in my group have no falsetto at all and several times we've been asked to use it--particularly to slide seamlessly into it.

Anyway, I have the Beach Boys to thank for my choral career. (I've tried to sing a few 4 Seasons hits, but Frankee Vallee just goes too high---how does he do it?--was that a studio trick?)

At, any rate, I'd definitely sing any Beach Boys hit in the car--top 10--no particular order--

Don't Worry Baby
Fun Fun Fun
Wendy
California Girls
Surfer Girl
Be True To Your School
Sloop John B.
Wouldn't It Be Nice?

and just for a break, to round it off--2 non Beach Boys

Under the Boardwalk--love to sing all the parts
The Lion Sleeps Tonight --same

It would be real easy to make other, long, lists, especially of doo-wop--alternating singing the various parts.