Hey there. I wanted to thank you for supplying the sound clip. I came across it while searching for an intro to a song of mine. I knew it was the right fit as soon as I heard it the first time! My album will be releasing in the next month hopefully. You can hear a sample clip of "Good Times Roll", which has the intro, and clips of all the rest of the material on my album @ ZacEdingtonBand.com Thanks again!
the notes are A, B, C. those are the 2nd, 3rd, and 4th scale degrees of the G major scale. or the 1st, 2nd, 3rd scale degrees of the A minor scale. you are right, though, that this could also be some notes from a C major scale or an E minor scale. good sleuthing!