I just upgraded my laptop to Windows 10, and Cortana is probably one of the coolest things I've ever seen, however there is always room for improvement. One thing I noticed was that she could play music from the windows music player, but not from Spotify. Since I do not use the Windows music player, but am a Spotify Premium subscriber, I would love to be able to play music through Cortana. I imagine it would also be the same idea for iOS's Siri. This would probably be beneficial to all involved, especially if it makes Spotify a pre-installed application on Windows or iOS Devices.