The history of rock music goes back to the distant 20's and 30's, when rock'n'roll motives could be heard in blues and old country songs. By the 1950's the obsession with rock music had begun, so if you ask your parents or grand-parents about the music they used to listen to when they were young, some of them will definitely remember longhaired "Beatles", scary Alice Cooper or even the earliest rock stars - Bill Haley, Chuck Berry and Little Richard. However, these days are gone and nowadays our parents and grand-parents are respectable people whose music tastes don't affect their life style or behaviour. And the more reserved they are, the more surprised they become when they get pranked by such crazy though quite mature rock fans!