by Héctor Castro & David Penelas
The 40s were the blues and country period played by Afroamericans and people who lived in the country. This music had a repetitive melody and the guitar as the leading figure.
From 1950 to 1960 was the rock period, which was spread by Alan Freed on the radio. Again, the guitar had the leading role, with artists like Chuck Berry, Buddy Holly or Jerry Lee Lewis.
At the end of the 1960s, heavy metal was born, which was created by the fusion of Rock’n’Roll, Blues, Psychodelic Rock, Progressive Rock and, sometimes, Folk Rock, all of them but specially Hard Rock, taking it to the extreme. Its pioneers were bands such as Black Sabbath, Led Zeppelin, Cream or Deep Purple.
The 80s were the disco period. It started to be more and more popular until the creation of electronic music, which is based on a DJ and a mixer.