Why not an app tied to the mic that recognises your ringtone and mutes everything? That means I reach for my phone rather than have to make any gestures first.
Another practical use of the technology in Shazam! Just gotta make it fast enough, which you probably could considering you just check it against one song vs. every song.
That's a great idea. We refer to those as passive gestures, and we will enable those in future too. Right now, starting simple and solving small problems first.