: The sound of Pi
Bruce Fleming email (remove spam text)
>>>>>>On Date: Wed, 30 May 2012 06:17:30 +1200
From: RussellMc <gmail.com> apptechnz
I didn't see where the 9 and maybe the 0 come from.
Should it matter:-).
The music theory behind this begins as shown in the video: with the C major scale (C D E F G A B C) the notes are numbered 1 through 8. To make things simple music theory also numbers the notes that occur after the second instance of C (or 8 according to the numbering).
So C D E F G A B C D E F G A would be numbered 1 2 3 4 5 6 7 8 9 10 11 12 13 and so as the notes keep happening. The reason for this becomes apparent when you go to give a chord a name.
A C major chord has the notes of C, E, and G. Let's take a chord with am extra note of D above the octave C. This would be C9 or sometimes seen as Cadd9 because D is the 9th note in the series. Cadd2 would have the D after the first C. This allows the musician to determine which notes to play.
Watch the video again and they should play the D above the octave C instead of the D above the first C used. This happens when the 9 appears with the note played. The number 2 should appear when they play D above the first C used. This should be easiest to see when the piano is on the screen.
See also: www.piclist.com/techref/io/audio.htm?key=sound
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