WiFi music server and gapless playback function will be available at a later date TBA via firmware upgrading.

ENGADGET: HiFiMAN launches HM-901 'high resolution' audio player, we go ears and hands on

Some, like Slim Devices' SqueezeBox, focus only on music and even come with server software that can serve the same music to multiple devices simultaneously.

ENGADGET: Switched On: The musical mesh for the moneyed

On the internet, anyone with the nous to set up a server to stream music and who can sign the contracts with the record companies can launch one or many such stations.

FORBES: Spotify's US Launch and Pandora's Problem