Big-beat (also caled 'big beat' or 'bigbit') is a term used in Eastern Bloc countries in 1960s to cover rock and roll and relative genres, as the original name was unaccepted by communist authorities.
Genres of American origin, such as jazz, twist and especially rock and roll were banned or at least hardly tolerated in Eastern Bloc countries in the middle of 20th century. Such music was considered as an element of American imperialism. However there were several jazz bands in those area. In 1950s these bands included some rock and roll elements in their performance. The first Polish band that officially played rock and roll was Rhythm and Blues formed in 1959 and forced by authorities to disband in 1960. Manager of Rhythm and Blues, Franciszek Walicki, to avoid the term rock and roll, used a form "Big-beat" to name the band's genre. In Walicki's intention it was a pure synonym of rock and roll, but the name became widely used to any popular music with strong rhythm and simple melodic structure, such as rhythm and blues, madison or twist.
The first Walicki's big-beat band was disbanded, but he formed new bands, eg. Niebiesko-Czarni and rock and roll covered by the name big-beat become popular in Poland from early 1960s. In Czechoslovakia and Hungary it happened in the middle of 1960s. The first rock and roll concert in the Soviet Union was performed in the Ministry of Foreign Affairs in 1966. However, in the USSR rock was performed without specific genre name, and rock bands were called just "vocal and instrumental bands" (VIA (music)). In Poland and Czechoslovakia the term "big beat" or "bigbit" was mostly used, while in Hungary it was called "beat".
The term "big-beat" was used in Poland mostly in 1960s, while in 1970s rock was called "young generation music", and it changed as progressive rock or electronic music emerged, and in 1980s the name "rock" was already accepted by authorities.