https://www.engadget.com/2004-10-17-phontuner-voice-and-guitar-tuner-for-smartphones.html
PhonTuner voice and guitar tuner for Smartphones
Oct 17, 2004 - After watching American Idol a few times we're pretty sure there's more than a few people out there who could use a little pitch improvement, so William Hung,...
voice and guitartunersmartphones