Have you ever played or streamed sound controlled in a command line? I myself play & stream every sound controlled through command line interface. To achieve that I use an odroid c2 connected to my av-receiver.
For one year I have tried to create my own YouTube Audio Player. I wanted something that can play my playlists and favorite music from YouTube, but I only wanted the sound – no video. In that case I usually used a separate browser-window or -tab and that was sometimes very annoying.