Professor Hans Hickmann from the Museum of Cairo had analyzed a system of hand signs called "chironomy" that he'd found engraved on several mastabas in Egypt, and from them developed various gestures shown on scale above. The scale is pentatonic, with eleven degrees and several modes which were played on instruments as well as sung. Ancient choir directing was originally done using hand signs or signals, which qued the choir to various tones of notes and cords.
See some hand signs on the Gallery Site. The use of hand signs is very archaic, and found on many ancient pictographs. Forms of these hand signs are still in use today, although often modified as in modern orchestra conducting, some folk dances, and signs for the deaf, etc. The Player below plays a very, very few samples of the ancient Greek-Egyptian scales, which tones are still found in Japan on the kyoto.<5>