Mom fell a few months ago. No brain bleed or diagnosed TBI. She's been hearing 2 songs softly since the fall. Should we contact her MD?

Kelly, does your Mom wear a hearing-aid? If yes, it could have been jarred in your Mom's fall. My Mom use to hear talk radio when she first got her hearing aids... the hearing aids were adjusted and the radio was gone.

Look up "Musical Hallucination". This is not unusual, esp with brain injury. There may be a connection with fall; there may not be.
Speak to the doctor about it. Much information online.

I have no idea. I’m bumping this question up so others will answer it.

Best wishes to you and your mom.