How to invoke Siri’s music recognition feature using an Activator gesture

One of the cool new iOS 8 features of Siri is its integration with Shazam allowing you to use it to quickly identify which song is playing. All you have to do is to launch Siri and say the phrase “What’s this song” and it will quickly use Shazam’s music recognition service to display the name of the song along with its price tag in the iTunes Store.
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