Apple Watch - Other Features Including Music

I am still enjoying my experience with the Apple Watch.  It is fascinating to be working on school work when a student phones me on the iPhone.  The iPhone happened to be in another room, but the phone rang on my Watch and the MacBook.  I answered on the MacBook, but could have just as easily used the Watch.

I noticed that when I selected music, that the music played from the iPhone.  With a little more investigation, I realized that I could load music on the Watch and play it from the Watch.  Will explore that more after I get final course grades submitted for this semester.

I noticed Air Play icon but it is grayed out. The  information in the 9-5 column below provides a very good review of the Watch features.  I suspect new OS features might make it have more meaning.  

http://9to5mac.com/2015/09/21/watchos-2-apple-watch-feature-walkthrough/