Writer Timothy Ryback. He's just written a book chronicling the history of rock music in eastern Europe and the Soviet Union. In the book, "Rock around the Bloc," RYBACK shows how rock music has been a presence there from the mid-1950's beginning with the Elvis Craze, and continuing with Beatlemania, and punk and heavy metal music. The rock movement spawned officially sanctioned bands as well as underground groups. Ryback says the recent events in Eastern Europe were foreshadowed in 1988 when government policy on rock bands were loosened there.