The 1975 Music City USA 420 was a Winston Cup (now Nextel Cup) event held at Nashville Speedway USA on May 10, 1975. Darrell Waltrip led 147 of the 420 laps while outpacing the field by two laps for the first of Waltrip's eighty-four victories. Points leader Richard Petty finished 7th and still held a 225-point championship lead on Dave Marcis (4th). Stats