The device would be aware where it is located - or moving via either gps, accelerometer or wifi ssid visibility or even an ibeacon.

The device will then know that it should play from selected sets/playlists that I have tagged appropriate for that location.

I would like this in a video library management app as well.

Basically, the content most likely to be relevant to my current location or activity should float to the top of the playlist or click-field.

All content should obviously be available, but preference to play a cetain list over another based on location or activity without overt action from me.

Kind of like an "ok google - I am now running so play my running lists" and "ok google - I just arrived at my office so either STFU or play my worklist"

"Looks like you just got on bart list"