You can use IFTTT to set up a geofence on your phone. IFTTT calls these things recipes. You would create a recipe to detect that you (your phone) has come home and then play music on your Echo device.
IFTTT used to be completely free. There is a limited free version now. I'm not sure if geofencing is part of the free version. I haven't used IFTTT in a few years.
There are probably other ways to do the same thing without using IFTTT. This is just one way that I thought of immediately.