How to find Chords of any song using software

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Update: [03/01/2015]: Check this video for the mac version https://www.youtube.com/watch?v=-kHIF3eXbjw In this video, I tried to make a tutorial about how to find guitar chords of a song. I have used a Bengali song to make the tutorial, but it should work fine with any kinds of songs. Links shown in the video: Sonic Visualizer: http://www.sonicvisualiser.org/download.html Chordino: http://isophonics.net/nnls-chroma/ Tabtuner: http://tabtuner.com/ The chords of this song is submitted to Ultimate Guitar http://tabs.ultimate-guitar.com/l/lrb/sei_tumi_crd.htm . I do not own copyright of the song, so it is only for educational purpose. Song covered at 6:10 is Shei Tumi - by LRB. The Rhythm is not correct, BTW http://www.youtube.com/watch?v=hAem7Gd-X1Q