It's Barenaked Ladies, the song is called One Week. At least, I think that's the commercial you're talking about.
> does anyone know the name of the song in the ford commercial...
: there are 5 people in the car wgen the song starts and they start
: singing to it (badly :) the two in the from seat are women and the
: one in the (front) passenger seat is wearing a cowboy hat...
> please email me if you know the name/artist