An explanation is here.

Un explanation es hic.

   .     e      b      g      d      A      E
# Tempo 48
8
# Pythagoras, major chord
8               3  81/64      5
# Aristoxenos, major chord
8               3    5/4      5
# and again
8               3  81/64      5
8               3    5/4      5
#        e      b      g      d      A      E
8
# Pythagoras, minor chord
8               3  32/27      5
# Aristoxenos, minor chord
8               3    6/5      5
# and again
8               3  32/27      5
8               3    6/5      5