Friends I would like to extract a piece of guitar chords from a song. I have searched and find out two videos on youtube describing that Audacity will do the job. However the method used only separate vocal from instrument and not the particular piece. I had download Audacity and just playing with it, but unable to extract from 1:17 - 1:36 minute duration guitar instrumental piece.

Have anyone idea how to accomplish this task? Thanks in advance.