Shazam users have tagged 5 billion songs

"Shazam®, the world’s leading media engagement company, today announced it has reached a major milestone – fans around the world have used the service to identify songs and experience more with TV shows and ads over five billion times.  P!nk’s new song “Blow Me One Last Kiss” marked the five billionth tag.  In addition to its leadership in music discovery, Shazam’s rapid expansion into television has given people new opportunities to use the app to engage with their favourite shows and ads for additional content and exclusive offers."

Source:  Shazam Blog, 7th August 2012