whining noise on highway speeds

Hi everyone, noticed a whining noise coming from front of the car.. appears when driving ~ 70-75mph if I release gas pedal just for a second, the speed doesn’t drop, but the sound dissapears, when pressin the pedal it comes back car is Legacy 2015y 2.5l with 39000 miles on odo. can’t tell if it appeared now since I rarely drive on highway and when I do, the music plays loud to “kill” the wind noise