Correct me if I'm wrong, people, but doesn't he have to add her account to his phone so that Google Play will permit downloads to the device? I had to do something like that with my wife's phone so that she could download any of the apps I bought. Google isn't trying to hose you. That's Apple's job.
Help me out, everyone. Don't know the exact method, but there should be a simple way to get the songs you paid for. Here's how CNET says to do it for apps:
How to install paid apps on multiple Android devices | How To - CNET