Who knew Siri could rap?

Since Siri was released for the iPhone 4S developers have been able hack it so it can start a car, control lights, fans and even a TV. Now a developer has hacked Siri to rap Notorious B.I.G.’s Hypnotize song.

The hack uses SiriProxy to intercept the communication with Apple’s servers. Siri’s speech synthesis is then synced to the beat using the timestamps obtained from the Echonest API which were then manually tweaked, to smooth out delays in the text-to-speech engine.

Siri turns out to be a decent rapper in this amusing video.