I was just wondering how most of you go about thinking of notes and their relationships to each other. I'm getting a but confused about two ways of thinking that I've come across. As an example, if I'm playing a C in the key of C major (3rd fret, 3rd string) and then play a G (5th fret, 2nd string), the G I play is the 5th in the scale, and a perfect 5th interval. If I play the C again, and then the G an octave down (3rd fret, 4th string), I'm still playing the 5th of the scale (an octave down), but now I'm playing a perfect 4th interval. I guess I'm really wondering what I should be thinking when I'm practicing scales or training my ears or improvising. Whenever I play a C followed by a G, should I be thinking to myself: "I'm playing root then 5th" "I'm playing root then 5th an octave down" "I'm playing root then 5th an octave up" or "I'm playing root then a perfect 5th up" "I'm playing root then a perfect 4th down" "I'm playing root then a 13th up" Or am I just confusing myself horribly?