I know this is way late and will probably get buried, but when my grandmother died in a car accident about 6-7 years ago, my mom's home phone kept getting calls, about 3-4 times a week, give or take.. But every time we'd pick up these calls it'd just be some very old jazz type music (probably from the 40 and 50s) playing softly. This was the same music my grandmother used to always be listening to around the house, I remember being around it all the time.
No one would talk, it would just play the music for a couple minutes then disconnect. Was also an unknown number, and these calls only started a couple weeks after she passed and probably went on for a few months then randomly stopped.
It weirded us out a lot.. The timing for that to happen, and of all the music choices..