Easily find the note in a song, and accelerate your learning of playing a song. Sound Sight listens using your microphone and plots the pitches that it hears to the common musical staff.
As you scroll down the lower pitches are shown, as you scroll up, higher pitches are shown. Roughly In the middle is the human voice, where you can see the decomposition of the pitches/frequencies that your voice is composed of by humming into the microphone.
Notes are represented by a green for naturals and blue for sharps. A green line on A4 means that your phone hears a sound with a pitch that you will play on a musical instrument as A4. The more green the louder the pitch and the more invisible the quieter the pitch is heard.
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http://www.reddit.com/r/valeonom
If you have any important concerns its best to email directly.