5. Web player
6. Homepage
7. Settings
8. Search
9. Discover


## Global UI
    * What happens when JS is off?
        => https://www.allantatter.com/react-js-and-progressive-enhancement/

## Miscellaneous
    * See TODOs in the code
    * https://facebook.github.io/immutable-js/ ?
    * Web workers?
    * Accessibility and semantics