Some of you may have met the famous app guitar tuna, which is awesome for tuning guitars.... you see your pitch changing over time, displayed as a downward flowing histogram of pitch. Why not?
This program is a fork of Bjorn Roche's guitartuner,
http://blog.bjornroche.com/2012/07/frequency-detection-using-fft-aka-pitch.html
with added pitch histogram. Thanks Bjorn, this helped me a lot !°!!!!!!!! It is supposed to be somewhat intuitive .... running in a linux console. If you like it, you should buy Bjorn a cup of coffee

This code is in the language c :
ccgt-0.1.tar.gz
this is really great. so lightweight with just 11kb. can you add better support for input devices?