The G Clefs sang I understand.

The clefs in music scores appears way down in the Medieval period: centuries before the modern notation came into practice. The ancient clefs had no names such as treble clef or bass clef. Some of oldest clefs are F clef and G clef. They had no fixed position in the staff: also known as dynamic clefs. The alto clef and tenor clefs are two positions derived from the ancient C clef.

All musical clefs indicate the position of a specific note on the staff. The treble clef is a G clef, because it shows the location of the note G.

The G clef is one of many clefs used in music, and the different clefs represent different ranges of notes. Different clefs accommodate different instruments, depending on their ranges. The G clef is one of the better known clefs; it is a mid-range clef and along with the F clef it is standard for almost all piano music. You will note that the fancy "G" that is the symbol for the clef forms an 'x' over the fourth line down in the clef, the line that represents the note 'g'. This is the g one fifth above 'middle c' on the piano, and it is a whole step below the 'a' that has a frequency of 880 cps. The 'a' below middle c on the piano is tuned at 440 cps, the current standard pitch for most musical purposes.

Clefs do not always represent absolute frequencies for every application. I believe that sopranos and altos, while they use the G clef, in reality produce tones that are an octave above the standard suggested pitches. The use of clefs is a matter of convention and convenience.

The Clefs was created in 1963.