CIBERGRAFIA

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https://www.google.com.co/search?q=historia+de+la+musica&biw=1600&bih=799&source=lnms&tbm=isch&sa=X&ei=A3YZVJaxBcfEggSt-IH4DA&sqi=2&ved=0CAYQ_AUoAQ#facrc=_&imgdii=_&imgrc=kF0Ovkuc2BAMbM%253A%3BuAarew5-wIzcjM%3Bhttp%253A%252F%252Fhtml.rincondelvago.com%252F000066461.png%3Bhttp%253A%252F%252Fhtml.rincondelvago.com%252Fhistoria-de-la-musica_6.html%3B325%3B240     

http://www.lpi.tel.uva.es/~nacho/docencia/ing_ond_1/trabajos_06_07/io6/public_html/historia_evolucion.html

https://www.google.com.co/search?q=evolucion+de+la+musica&biw=1600&bih=799&source=lnms&tbm=isch&sa=X&ei=xLUZVIfmNIfPggTz5YKQBw&sqi=2&ved=0CAYQ_AUoAQ#facrc=_&imgdii=_&imgrc=i5TXXi06jVX9pM%253A%3BonN4JdpBCiYLMM%3Bhttp%253A%252F%252Fkevinefarias.files.wordpress.com%252F2011%252F05%252Fcuerda.gif%3Bhttp%253A%252F%252Fkevinefarias.wordpress.com%252F2011%252F05%252F16%252Fevolucion-de-la-musica%252F%3B408%3B282