Hi Hutcheson,
Could you please create the 20th century in music history? http://dmoz.org/Arts/Music/History/
Your music history category stops in the 19th century and does not leave America. :-)
The styles in music by decade are here: http://dmoz.org/Arts/Music/Styles/By_Decade/
this is an example: http://dmoz.org/Society/History/By_Time_Period
Thanks is advance.
Jan Geerinck