The Google Play store won't let him buy an app unless he has a supported device installed. The chatroom says he could install the Android SDK and create a virtual tablet and register it. That's a long way to go to save a few bucks though. He could also go to a brick and mortar store, log into the Play Store with a demo device and buy the app that way. He may be able to buy a gift certificate. Another option is to contact the app developer and tell them the dilemma. Maybe they'd do something for him.
No, but there are plenty of other options for having more control over his music. Pandora is an internet radio station that is free with ads or without ads for a small monthly fee. The music industry allows it to exist because there are some limitations with it. For instance, it's not possible to pick a song and it only allows for a certain number of song skips per day.
Leo says that Adobe makes a flash player for Android if he has Gingerbread OS or later. Go to play.google.com and search for "Adobe Flash Player". They have announced they'll be discontinuing it though, so he should get it while he can.