I finally caved to Amazon's relentless efforts in promoting Prime Music and downloaded and installed the app on my PC. Know what? I'm glad I did. The app places Prime Music, your personal music collection, and a stupendously massive collection of free music samples ALL IN ONE PLACE.
The app is incredibly intuitive; I was able to figure out most or all its functionalities with a few exploratory clicks. I really, really like the Drag and Drop interface to (1) download your music collection and (2) create a playlist of tracks across different albums. And I really like that you have to double-click to play a track, which makes it hard to inadvertently play a track by mistake.
Now, if Amazon would only add an equalizer and looping for ONE SONG (instead of the entire album or playlist), this app would be just about perfect.
—nTip: Don't buy the digital copy of an album. Instead, buy the CD and Amazon will automatically rip it for you, so you get the CD AND a digital copy. The digital copy doesn't count towards your cloud storage.