Macworld UK:

From now until New Years Eve you can get a six months subscription to Apple Music for free. All you need to do is Shazam something with the Shazam iPhone app. When you do so you will automatically be able to sign up for six months Apple Music for free.

The deal isn’t only open to those who have never subscribed to Apple Music. Apple has confirmed to Macworld that previous subscribers who resubscribe can get three months for free.

Great deal if you’ve never signed up although, while the story says resubscribers can get three months free and the app says “Get up to four months of free Apple Music,” when I went to redeem the code I was only offered a one month free “Apple Music individual membership.” so YMMV.