2011 Subaru Outback hums @ 60 mph

source of humming noise at 60 mph, car has 75K on it

Musician hiding in the trunk? Harmonica’s disease?

If you describe the humming a bit more and a LOT more about what model Subie you have… AWD, FWD, automatic, manual, recent tire or brake replacements, original rear tires on a FWD car… stuff like that, and we will try and help

I think all Subarus are AWD.

Years ago there were 2WD versions.

Yes, but you would have to go back about 2 decades to find a FWD Subaru, rather than an AWD Subaru.