Apple Inc. is close to acquiring Shazam Entertainment Ltd., the startup whose music recognition app is already built into Apple’s Siri virtual assistant, according to a person familiar with the discussions.

A deal for the London-based app maker could be announced as soon as Monday, said the person, who declined to be identified because the details are not yet public.

The Shazam app uses the microphone on a smartphone to identify almost any song playing nearby.

Apple slowly build up one of the largest spy empires. Songs identification is not all, value of recordings and owners details plus coordinates of user phones Shazam sends to owners must not be underappreciated.