These sites will have that information.
http://www.google.com/search?hl=en&ie=ISO-8859-1&q=musical+eras+that+the+beatles+played+in&btnG=Google+Search&aq=f&oq=musical+
Psychedelic and beatle mania were two eras that the beatles played in. What were the two other eras that the beatles played in?
2 answers
how did music develop in african-american history in america