There are several apps available that allow for remote controlling of all kinds of PC music players. As for streaming music to your phone, there are also several options. I went with a miniDLNA server on my Linux machine (where I store all my media). For Windows you might want to check out Plex, which is imho great for these purposes. Bluetooth isn't much of any concern, as whatever app you're using automatically "forwards" its audio output to any actively connected Bluetooth speaker.
01-19-2015 07:14 AM