This hack, accomplished for the Music Hack Day 2011 competition in London, has Siri laying down some serious flow in a rendition of Hypnotize by Notorious B.I.G. It’s actually far better than I thought it would be before I watched it.

Creator Robert Boehnke explains how the hack was accomplished:

SiriProxy is used to intercept the communication with Apple’s servers. Based on your song request, Notorious Siri then sends your choice of Notorious B.I.G.’s Hypnotize and an a-cappella rendition of Queen’s Bohemian Rhapsody to the device (the latter requiring 4 iPhones 4S).

Siri’s speech synthesis is 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.