[sfsylvester]

Similar thing happened to me. Calvin Harris and Armin Van Buuren happen to come up on the office SONOS. And then Shazam thinks it's prudent to notify me that they've both joined as part of their new feature.

But ultimately, Shazam works on treating the individual fingerprints of songs then running transformations. So even if it was possible on iOS, which it isn't', they wouldn't be storing individual voices etc.