Replaced the wheel bearing and I think the sound has disappeared. Crossing fingers it lasts...thanks!Probably a hub starting to go. I had to change mine in my old '09 around the 100k mile mark.
Hub bearings are a common wear item, had to do them in both my old 'bu and my Tahoe at the 80k to 100k mile mark. Had them fail in a few old Sables I've had in the past also.
Louder sound the faster you go is the sign and sound difference on turning also. More or less weight on the wheel changes load on bearing and affects it's sound.