Volvo sings at 62 mph!

My 1995 Volvo starts making a loud high-pitched tone in the front end at highway speeds - related to airspeed not RPM. Sound starts when travelling at 62 with a head wind, 70 with a tail wind. Sound doesn’t change with any changes to ventilation system - turning fan on or off, opeing vent etc. Can’t localize sound, but seems to be in front of dash. What is it?

Is this the station wagon version with the singing roof rack? Seriously, I’ve heard of this on a Volvo wagon before. If it’s a sedan, I have no clue.