One of the year's greatest events around is Elkhart Lake Wisconsin, the classic 4 mile road course "Road America" hosting the Historic Grand Prix 3-litre Formula One cars [
http://www.historicgrandprix.com/ ] in action on a course meant for all their glory.
Its a stirring sound, all those DFVs (and the occasional Ferrari and BRM) blasting through the forests, down the long straights untarnished with chicanes and the like.
This is James King in Vittorio Brambilla's March 761.