I wonder how third party apps would interact with Siri.
"What is the music that is playing now?"
Shazam and SoundHound would want to be the service provider for this kind of query. How Siri would select which app to use?
Same as android does when you trigger a task that more than one app can handle: it asks you (and you can, off course, tell it to remember you choice so it doesn't bother you again in the future).