Czerwone Gitary (lit. The Red Guitars) is one of the most popular rock bands in the history of Polish popular music. The band formed in 1965 and achieved its greatest success from 1965 to 1970. Often considered the Polish equivalent of the Beatles, many of their hits are now classics in Poland. The group toured extensively outside Poland (in Czechoslovakia, Hungary, United States, Germany and Soviet Union) but had mostly disappeared from the Polish scene by the 1980s. The band reformed in the 1990s.

Source: Wikipedia (https://en.wikipedia.org/wiki/Czerwone_Gitary)