Actions for Currently Playing Song

At the moment, there isn't a fast, easy way to perform actions on the currently playing song without finding it in the list view. I would suggest adding a disclosure triangle and a menu/popover next to the track info in the toolbar.

Some actions we may want to perform on the currently playing song:

* All the normal stuff like deleting, rating, adding to a playlist
* Tweet, Facebook, or otherwise share that you're playing this song
* Show Lyrics
* Email, Instant Message, or otherwise share the song file itself