There are several theories about the origin of music in a general sense. According to
Charles Darwin, it has to do with the choice of partner between woman and man (women choose male partners based on musical performances), and so the first music would be love music. However,
Herbert Spencer saw music develop from a passionate eloquence, and music arise as an expression of emotions. In
Ancient Greece, music was made at weddings, and there were love songs, as
Erato as a muse was the protector of the love song, but knowledge is based on myths and on archaeological evidence, not on written music. In the 9th century a musical notation was developed in the
Eastern Roman Empire, the
neume notation, and after the addition of lines the
staff was created around the 11th century, such that the exact form of music is only well-documented from this period. ' ==Medieval music==