) and thus we have the modern turn, so much used by Wagner.
Now while this notation was ingenious, it still left much to be desired as to pitch. To remedy this a red line was drawn before writing these signs or neumes, as they were called. This line represented a given pitch, generally E; above and below it were then written the signs for the notes, their pitch being determined by the relative position they held in regard to the line. Thus
was the equivalent of
, considering the line as being middle C pitch, a fourth higher F. This was the condition of musical notation in 1000 A.D.
To Guido d'Arezzo is ascribed its development up to some semblance of our present system, although the claim has often been denied. It is certain, however, that the innovations were made at this period. In the first place Guido made the red line always stand for the pitch of F, and at a little distance above it he added another line, this time yellow, which was to indicate the pitch of C. Thus the signs began to take very definite meaning as regards pitch; for, given a sign extending from one line to the other, the reader could see at a glance that the music progressed a fifth, from F to C, or vice-versa. And now the copyists, seeing the value of these lines in determining the pitch of the different signs, of their own account added two more in black ink, one of which they drew between the F and the C line, and the other above the C line, thus
. By doing this they accurately decided the pitch of every note, for the lowest line, being F, the line between that and the C line must stand for A, and the two spaces for G and B; the top line would stand for E, and the space between it and the yellow line for D. Little by little these copyists grew careless about making the lines in yellow, red, and black, and sometimes drew them all in black or red, thereby losing the distinguishing mark of the F and C lines. In order to remedy this, Guido placed the letters F and C before the lines representing these notes, thus