Apple has completed its acquisition of Shazam, one of the world's most popular and highly-rated music apps, used by hundreds of millions of people worldwide.

Shazam lets users identify songs by listening to the music playing around them. The app will soon be available ad-free for all users.

The app has been downloaded over 1 billion times around the world, and users identify songs using the Shazam app over 20 million times each day.