Harmonic sound when braking under 5 mph

I think it's coming from one of the rear drum brakes but I'm not for sure. I hear it just as I'm coming to a stop. It just started happening a few days ago. I have a 2023 trd or. I 35k miles mostly highway. I'm on a 3 month overlanding trip. I have been driving down dirt forest roads some

 

It’s likely nothing to worry about.

 

Mine does it too. Happens right before you come to a stop at a super slow speed. The tech at my dealership said it was due to brake dust buildup in the rear brake drum assembly. Not hurting anything. Should go away with cleaning both rear brake assemblies.

 

Like Simon and Garfunkel?
Or is it more like Peter Paul and Mary...
Perhaps Crosby Stills Nash and Young ?... now that would be awesome