I think I agree with you guys, I believe that through experience, like playing a lot of songs, learn more chord progressions... learn more scales... whatever we listen or hear from the radio or CD player... we can visualize the chords or cales from what we experience...it is not whether we play the exact chords or scales that matters, it is whether we know we play is out of tune from what we heard that matters. Hmmm...I guess I am confused by myself too... ;p